Tag: David (page 3 of 6)

Lost memories may not be gone forever, new brain research says




Excerpt from
sciencerecorder.com


New research from the University of California at Los Angeles (UCLA), studying how memories are stored, finds that lost memories can be recovered—offering possible hope for patients suffering from the early stages of Alzheimer’s disease.

The finding contradicts the long-held belief that memories are stored at the connections between neurons, or synapses—areas that are destroyed by Alzheimer’s disease.

“Long-term memory is not stored at the synapse,” said lead author David Glanzman, a UCLA professor of integrative biology and physiology and of neurobiology, in a statement. “That’s a radical idea, but that’s where the evidence leads.”

According to Glanzman, the nervous system can regenerate lost or broken synaptic connections. If synaptic connections can be restored, memory will return. “It won’t be easy, but I believe it’s possible,” he said.

The findings recently were published in the open-access journal eLife.

Glanzman said the finding that the destruction of synapses does not result in the destruction of memories could have important implications for people with Alzheimer’s disease.

“As long as the neurons are alive, the memory will still be there, which means you may be able to recover some of the lost memories in the early stages of Alzheimer’s,” Glanzman said.

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‘Holy grail’ of shipwrecks found? Mystery ship found at the bottom of Lake Michigan

Divers inspect a hole being dug beside a wooden beam jutting from the floor of Lake Michigan during a search for the Griffin.   (AP Photo/Great Lakes Exploration Group, David J. Ruck ) ...

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What happens when you point a telescope for black holes at the sun?

The first image of the sun captured by NASA's Nuclear Spectroscopic Telescope Array (NuSTAR), which is sensitive to high-energy X-ray light. X-rays seen by NuSTAR show up as green and blue in the photo, which is overlaid on an image taken by NASA's Solar Dynamics Observatory.

Excerpt from
csmonitor.com


A NASA space telescope designed to peer at faraway black holes has snapped a stunning image of the sun, showing that its sensitive X-ray eyes can investigate mysteries in Earth's own neighborhood.
The new image, which was taken by NASA's NuSTAR spacecraft (short for Nuclear Spectroscopic Telescope Array), is the best-ever view of the sun in high-energy X-ray light, space agency officials said. The photo, and others taken by NuSTAR in the future, should help researchers learn more about our star, they added.

"NuSTAR will give us a unique look at the sun, from the deepest to the highest parts of its atmosphere," NuSTAR team member David Smith, of the University of California, Santa Cruz, said in a statement. 

The new image, which was released Monday (Dec. 22), overlays NuSTAR observations (seen in blue and green) onto an image of the sun captured by NASA's Solar Dynamics Observatory spacecraft.

NuSTAR solar observations might also reveal more about the nature of dark matter, the mysterious stuff thought to make up most of the material universe.

Dark matter apparently does not emit or absorb light — hence its name — and nobody knows for sure what it's made of. A number of exotic particles have been proposed as dark matter constituents, including weakly interacting massive particles, sterile neutrinos and axions.

If axions exist, NuSTAR may see signs of them — patches of X-rays in the center of the sun — NASA officials said.

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Must-See Geminid Meteor Shower Peaks This Weekend: An Observer’s Guide



2014 Geminid Meteor Shower Sky Map


Excerpt from
space.com

The spectacular Geminid Meteor shower hits peak activity this weekend. Though competing with some unfortunate moonlight, the shower still should make for a must-see astronomical event.

While moonlight will somewhat hinder this year's Geminid meteor shower, intrepid observers with good weather and low light pollution should still be able to catch a good meteor show Saturday (Dec. 13) night.

"If you have not seen a mighty Geminid fireball arcing gracefully across an expanse of sky, then you have not seen a meteor," note astronomers David Levy and Stephen Edberg. 


Even if you can't see the meteor display from your part of the world, you can watch them online. The online Slooh Community Observatory will host a live webacst of the Geminid meteor display on Saturday night beginning at 8 p.m. EST (0100 Dec. 14 GMT).You can also watch the Slooh webcast directly:http://live.slooh.com/. NASA meteor expert Bill Cooke will also host a live Geminids webchat on Saturday night from 11 p.m. to 3 a.m. EST (0400 to 0800 GMT), as well as a live webcast.
You can watch the webcasts of the Geminid shower live on Space.com, starting at 8 p.m. EST, courtesy of Slooh and NASA. The Italy-based Virtual Telescope Project will also host a Geminds webcast, beginning at 9 p.m. EST (0200 GMT).

Although the bright moon will be high in the sky by 11:30 p.m. local time Saturday (Dec. 13) (during the shower's peak), skywatchers can still catch a potentially incredible show before the moon creeps above the horizon, washing out the sky. Stargazers might be able to see an average of one or two Geminid meteors per minute Saturday before the moon rises.

By around 9 p.m., the constellation Gemini — the part of the sky where the meteors seem to emanate from — will have climbed more than one-third of the way up from the horizon. Meteor sightings should begin to really increase noticeably thereafter. By around 2 a.m., the last-quarter moon will be low in the east-southeast, but Gemini will stand high overhead. So you might still see a good number of meteors in spite of the moon's presence.

A brilliant shower

The Geminids are, for those willing to brave the chill of a December night, a very fine winter shower, and usually the most satisfying of all the annual showers. They can even surpass the brilliant August Perseid meteor shower.

Studies of past displays show that the Geminid shower is rich both in slow, bright, graceful meteors and fireballs, as well as in faint meteors, with relatively fewer objects of medium brightness. Many Geminids appear yellowish in hue; some even appear to form jagged or divided paths.     

These meteors travel at a medium speed and appear to emanate, specifically, from near the bright star Castor, in the constellation of Gemini, the Twins, hence the name "Geminid." In apparent size, that's less than half the width of the moon. As such, this is a rather sharply defined radiant as most meteor showers go. It suggests the stream is "young," perhaps only several thousand years old.

Generally speaking, depending on your location, Castor begins to come up above the east-northeast horizon right around the time evening twilight comes to an end. As the Gemini constellation begins to climb the eastern sky just after darkness falls, there is a fair chance of perhaps catching sight of some "Earth-grazing" meteors. Earthgrazers are long, bright shooting stars that streak overhead from a point near to even just below the horizon. Such meteors are so distinctive because they follow long paths nearly parallel to the Earth's atmosphere. 

Because Geminid meteoroids are several times denser than the comet dust that supply most meteor showers and because of the relatively slow speed with which the Geminids encounter Earth (22 miles or 35 kilometers per second), these meteors appear to linger a bit longer in view than most. As compared to an Orionid or Leonid meteor that can whiz across your line of sight in less than a second, a Geminid meteor moves only about half as fast. Personally, their movement reminds me of field mice scooting from one part of the sky to another.

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Time Since Einstein ~ An exploration of the nature of time

Albert Einstein shattered previous ideas about time, but left many pivotal questions unanswered: Does time have a beginning? An end? Why does it move in only one direction? Is it real, or something our minds impose on reality? Journalist John Hocken...

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New Geologic Map Shows the Beauty of the Asteroid Vesta


This new map of the asteroid Vesta, which uses a Mollweide projection, reveals the asteroid's geological history.
This new map of Vesta, which uses a Mollweide projection, reveals the asteroid’s geological history. NASA/JPL-Caltech/Arizona State University



Excerpt from 
wired.com


For 15 months between 2011 and 2012, the Dawn spacecraft orbited the asteroid called Vesta, snapping high-resolution pictures of the cratered, potato-shaped rock. Scientists then spent another two and a half years poring over the images and piecing together the geology written on Vesta’s surface. Now, a team led by planetary scientist David Williams of Arizona State University has compiled that information together into this beautiful map, which they’ve published online for the December issue of the journal Icarus.

Vesta was forged within the cloud of dust and debris that formed the solar system about 4.5 billion years ago. During its lifetime, Vesta was pelted with smaller asteroids and rocks, which left a multitude of craters. But according to the researchers, there were three impacts in particular that shaped Vesta’s geological history. The most recent collision happened sometime between 120 million and 390 million years ago, forming the Marcia crater seen near the center of the map.

Two earlier impacts struck Vesta’s south pole more than one billion years ago between 200 million and one billion years apart, making the Veneneia and Rheasilvia craters, which are each about 300 miles in diameter. These collisions were so big that they reshaped the asteroid, leading to its elongated shape today, Williams says. 

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Dark matter may be massive & collide with Earth every billion years

 Excerpt from zeenews.india.com A new study has revealed that no evidence has been found that dark matter is made of tiny exotic particles, and it might be more massive.Researchers from Case Western Reserve University found that dark matter ...

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BBC: Scientists Discover New Race of Human Beings ~ Video Report

The ancient humans have been dubbed "Denisovans" after the caves in Siberia where their remains were found. Professor Chris Stringer: "It's nothing short of sensational - we didn't know know how ancient people in China related to these other humans" S...

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How can there be ice on Scorching Mercury? NASA Report

NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washingtonnasa.govMESSENGER Finds New Evidence for Water Ice at Mercury's Poles Mercury's North Polar Region Acquired By The Arecibo Observatory A Mosaic of MESSEN...

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U.S. Creates Largest Protected Area in the World ~ 3X Larger than California


Photo of fish swimming in the Palmyra Atoll.
A school of fish swims under the water around Palmyra Atoll, in an area of the Pacific that is already part of a marine sanctuary.
Photograph by Randy Olson, National Geographic



By Brian Clark Howard




NEW YORK—The Obama administration announced Thursday that it will create the largest marine reserve in the world by expanding an existing monument around U.S.-controlled islands and atolls in the central Pacific.


The Pacific Remote Islands Marine National Monument will now be nearly 490,000 square miles, nearly three times the size of California and six times larger than its previous size. Commercial fishing, dumping, and mining will be prohibited in the reserve, but recreational fishing will be allowed with permits, and boaters may visit the area.


The protected area that Secretary of State John Kerry announced this morning is actually smaller than the 782,000 square miles that the president initially considered. But environmentalists, preservationists, and conservation groups that had pushed for the expansion called President Barack Obama's designation a historic victory in their efforts to limit the impact of fishing, drilling, and other activities that threaten some of the world's most species-rich waters.

Map of the pacific remote islands.
MAGGIE SMITH, NG STAFF. SOURCES: U.S. FISH AND WILDLIFE SERVICE; USGS; MARINE CONSERVATION INSTITUTE


"What has happened is extraordinary. It is history making. There is a lot of reason we should be celebrating right now," said Elliott Norse, founder and chief scientist of the Seattle-based Marine Conservation Institute.


Enric Sala, an ocean scientist and National Geographic Explorer-in-Residence, called the newly expanded monument "a great example of marine protection."


During the past several years, Sala and National Geographic's Pristine Seas project—which aims to explore, survey, and protect several of the last wild places in the world's oceans—have been key players in expeditions to the region that helped to put a spotlight on its biodiversity. Sala also met with White House officials to make the scientific case for expanding the Pacific Remote Islands monument. 


Photo of a sea anemone providing cover for a transparent shrimp in Kingman Reef, Pacific Ocean.
Tentacles of a sea anemone provide cover for a transparent shrimp in Kingman Reef, which is part of the existing marine sanctuary. Photograph by Brian Skerry, National Geographic Creative


In announcing the expansion of protected marine areas, Kerry said, “We’re committed to protecting more of the world's ocean. Today, one to three percent of the ocean is protected, that's it. That's why President Obama will sign a proclamation today that will create one of the largest maritime protected areas in the world. It will be protected in perpetuity.”

Michael Boots, chairman of the White House's Council on Environmental Quality, made clear that by expanding protected areas, the administration sought to balance the need to preserve a range of marine species with concerns from the fishing industry, which had warned about the economic impact of curtailing deep-sea fishing areas.

"We thought [the monument decision] was a good way to balance what the science was telling us was important to protect and the needs of those who use the area," Boots said.


The administration said in a statement late Wednesday that "expanding the monument will more fully protect the deep coral reefs, seamounts, and marine ecosystems unique to this part of the world, which are also among the most vulnerable areas to the impacts of climate change and ocean acidification."


In June, when he first announced his intent to expand the monument, Obama said, "I'm using my authority as president to protect some of our nation's most pristine marine monuments, just like we do on land."


The June announcement was followed by a public comment period and further analysis by the White House, officials said. Thousands of people submitted comments, with many conservation groups and scientists offering their support. Some fishing and cannery groups, as well as a few members of the U.S. Congress opposed the expansion, citing the potential a loss of commercial fishing grounds. 


Norse said that the newly protected areas will safeguard endangered seabirds and other key species, including five endangered sea turtle species (such as loggerheads and leatherbacks), sooty terns and other terns, silky sharks and oceanic whitetip sharks, beaked whales, manta rays, red-tailed tropic birds, and deep-sea corals.

The expanded monument will help ensure that "there are some places that are as pristine as possible for as long as possible," Norse said. "I think a hundred years from now, people will be praising Barack Obama for having the vision to protect the Pacific remote islands."


"A Big Step"


Obama's Democratic administration is building on a national monument that was first created by his predecessor, Republican President George W. Bush, suggesting that "ocean protection may be one of the last bipartisan issues" in the politically divided United States, says David Helvarg, the author of several books on the ocean and the founder of the advocacy group Blue Frontier Campaign.

Democratic and Republican presidents going all the way back to Teddy Roosevelt, a Republican who served from 1901 to 1909, have used the 1906 Antiquities Act to designate national monuments. The law requires simply that an area be unique and considered worthy of protection for future generations. This is the 12th time Obama has used his authority under the Antiquities Act to protect environmental areas.

The area being protected by the administration will expand the protected areas from 50 miles offshore to 200 miles offshore around three areas—Wake Island, Johnston Atoll, and Jarvis Island—the maximum reach of the United States’ exclusive economic zone. The current 50-mile offshore protections around the Howland and Baker islands, and Kingman Reef and Palmyra Atoll, will not change.


"Although 71 percent of our planet is covered with saltwater, we have protected much more of the land than the ocean," Helvarg said. But the newly expanded monument is a big step in the right direction, he added.

Enforcing fishing bans in the monument will be a big challenge, Kerry acknowledged. "Agreements won't matter if no one is enforcing them," he said. "It's going to take training and resources."
Kerry said one measure that could help deter illegal fishing in the region, as well as around the world, would be to implement the Port State Measures Agreement, an international treaty that requires member nations to prevent illegally caught fish from entering the market. Eleven nations or parties have ratified the agreement, but a total of 25 must sign before the treaty will take effect.

"Our goal is to get this done this year," Kerry said.


Meanwhile, efforts to preserve more biologically diverse waters continue.


This week, National Geographic Society announced that it is dramatically expanding its campaign to help protect marine areas, with a goal of persuading governments to officially safeguard more than 770,000 square miles.


The plan, announced by former President Bill Clinton, includes programs that target the Seychelles—an archipelago in the Indian Ocean—northern Greenland, and South America's Patagonia region. The program builds on National Geographic's Pristine Seas project, which has financed ten scientific expeditions to remote areas of ocean around the world, including in the South Pacific and off Africa, Russia, and South America.

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Mysteries of the Early Human Ancestors #1 ~ Why did we grow large brains?

Human brains are about three times as large as those of our early australopithecines ancestors that lived 4 million to 2 million years ago, and for years, scientists have wondered how our brains got so big. A new study suggests social competition could be behind the increase in brain size. Credit NIH, NADA

livescience.com

There are many ways to try to explain why human brains today are so big compared to those of early humans, but the major cause may be social competition, new research suggests. 

But with several competing ideas, the issue remains a matter of debate. 

Compared to almost all other animals, human brains are larger as a percentage of body weight. And since the emergence of the first species in our Homo genus (Homo habilis) about 2 million years ago, the human brain has doubled in size. And when compared to earlier ancestors, such as australopithecines that lived 4 million to 2 million years ago, our brains are three times as large. For years, scientists have wondered what could account for this increase.

The three major hypotheses have focused on climate change, the demands of ecology, and social competition. A new statistical analysis of data on 175 fossil skulls supports the latter hypothesis. 

Behind the hypotheses

The climate idea proposes that dealing with unpredictable weather and major climate shifts may have increased the ability of our ancestors to think ahead and prepare for these environmental changes, which in turn led to a larger, more cognitively adept brain.
The ecology hypothesis states that, as our ancestors migrated away from the equator, they encountered environmental changes, such as less food and other resources. "So you have to be a little bit more clever to figure it out," said David Geary, a professor from the University of Missouri. Also, less parasite exposure could have played a role in the makings of a bigger brain. When your body combats parasites, it cranks up its immune system, which uses up calories that could have gone to boost brain development. Since there are fewer parasites farther away from the equator, migrating north or south could have meant that our predecessors had more opportunity to grow a larger brain because their bodies were not fighting off as many pathogens.


Finally, other researchers think that social competition for scarce resources influenced brain size. As populations grow, more people are contesting for the same number of resources, the thinking goes. Those with a higher social status, who are "a little bit smarter than other folks" will have more access to food and other goods, and their offspring will have a higher chance of survival, Geary said.


Those who are not as socially adept will die off, pushing up the average social "fitness" of the group. "It's that type of process, that competition within a species, for status, for control of resources, that cycles over and over again through multiple generations, that is a process that could easily explain a very, very rapid increase in brain size," Geary said.

Weighing the options

To examine which hypothesis is more likely, Geary and graduate student Drew Bailey analyzed data from 175 skull fossils — from humans and our ancestors — that date back to sometime between 10,000 ago and 2 million years ago.


The team looked at multiple factors, including how old the fossils were, where they were found, what the temperature was and how much the temperature varied at the time the Homo species lived, and the level of parasites in the area. They also looked at the population density of the region in order to measure social competition, "assuming that the more fossils you find in a particular area at a particular time, the more likely the population was larger," Geary said.


They then used a statistical analysis to test all of the variables at once to see how well they predicted brain size. "By far the best predictor was population density," Geary said. "And in fact, it seemed that there was very little change in brain size across our sample of fossil skulls until we hit a certain population size. Once that population density was hit, there was a very quick increase in brain size," he said.


Looking at all the variables together allowed the researchers to "separate out which variables are really important and which variables may be correlated for other reasons," added Geary. While the climate variables were still significant, their importance was much lower than that of population density, he said. The results were published in the March 2009 issue of the journal Human Nature.


Questions linger

The social competition hypothesis "sounds good," said Ralph Holloway, an anthropologist at Columbia University, who studies human brain evolution. But, he adds: "How would you ever go about really testing that with hard data?" 

He points out that the sparse cranium data "doesn’t tell you anything about the differences in populations for Homo erectus, or the differences in populations of Neanderthals." For example, the number of Homo erectus crania that have been found in Africa, Asia, Indonesia and parts of Europe is fewer than 25, and represent the population over hundreds of thousands of years, he said. 

"You can't even know the variation within a group let alone be certain of differences between groups," Holloway said. Larger skulls would be considered successful, but "how would you be able to show that these were in competition?" 

However, Holloway is supportive of the research. "I think these are great ideas that really should be pursued a little bit more," he said. 

Alternative hypotheses

Holloway has another hypothesis for how our brains got so big. He thinks that perhaps increased gestation time in the womb or increased dependency time of children on adults could have a played role. The longer gestation or dependency time "would have required more social cooperation and cognitive sophistication on the part of the parents," he said. Males and females would have needed to differentiate their social roles in a complementary way to help nurture the child. The higher level of cognition needed to perform these tasks could have led to an increase in brain size.


Still other hypotheses look at diet as a factor. Some researchers think that diets high in fish and shellfish could have provided our ancestors with the proper nutrients they needed to grow a big brain.
And another idea is that a decreased rate of cell death may have allowed more brain neurons to be synthesized, leading to bigger noggins. 

Ultimately, no theory can be absolutely proven, and the scant fossil record makes it hard to test hypotheses. "If you calculate a generation as, let's say, 20 years, and you know that any group has to have a minimal breeding size, then the number of fossils that we have that demonstrates hominid evolution is something like 0.000001 percent," Holloway said. "So frankly, I mean, all hypotheses look good."

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The Unstoppable Awakening of Humanity

by Zen GardnerWe’re undergoing an amazing transformation. Absolutely diametrically opposed to the constant, gradual attempt by elitists to shut down humanity via eons of engineered subjugation, we’re being consciously and vibrationally liberated by the very nature of the Universe in spite of all their efforts.It’s not readily apparent to most, but it’s very clearly there.It’s subtle and yet obvious at the same time. Knowledge of this change or shift in conscio [...]

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BBC: Churchill ordered UFO cover-up, National Archives show


Winston Churchill

bbc.com/news/uk


The government took the threat of UFOs so seriously in the 1950s that UK intelligence chiefs met to discuss the issue, newly-released files show.
Ministers even went on to commission weekly reports on UFO sightings from a committee of intelligence experts.
The papers also include a wartime account claiming prime minister Winston Churchill ordered a UFO sighting be kept secret to prevent "mass panic".
Drawing of UFO sighting
 Spotters often drew what they saw and sent pictures to the MoD

The files show reports of UFOs peaked in 1996 - when The X Files was popular.
The Joint Intelligence Committee is better known for providing briefings to the government on matters relating to security, defence and foreign affairs.
But the latest batch of UFO files released from the Ministry of Defence to the National Archives shows that, in 1957, the committee received reports detailing an average of one UFO sighting a week.
The files also include an account of a wartime meeting attended by Winston Churchill in which, it is claimed, the prime minister was so concerned about a reported encounter between a UFO and RAF bombers, that he ordered it be kept secret for at least 50 years to prevent "mass panic".
X Files
Nick Pope, who used to investigate UFO sightings for the MoD, said: "The interesting thing is that most of the UFO files from that period have been destroyed.
"But what happened is that a scientist whose grandfather was one of his [Churchill's] bodyguards, said look, Churchill and Eisenhower got together to cover up this phenomenal UFO sighting, that was witnessed by an RAF crew on their way back from a bombing raid.
"The reason apparently was because Churchill believed it would cause mass panic and it would shatter people's religious views."
Reports of sightings of UFOs peaked in 1996 in the UK - when science fiction drama The X Files was popular.
According to the files, there were more than 600 reports in 1996, compared with an average of 240 in the previous five years.

“Start Quote

UFOs have become the third-most popular subject for people to write to the ministry of defence saying please could you release this file”
Dr David Clarke National Archives UFO consultant

The figures for 1996 show 609 reported sightings of unidentified flying objects, 343 letters from the public to the MoD's UFO desk and 22 enquiries and questions from MPs.
But by 2009, the MoD's UFO inquiry desk -Sec(AS)2 - had been closed down.
The 18 files released on Thursday are the latest to come out as part of a three-year project between the MoD and the National Archives.
Dr David Clarke, a UFO consultant to the National Archives, explained why the papers are being made public now.
Dr Clarke told the BBC: "Since the Freedom of Information Act arrived in 2005, this subject - UFOs - have become the third-most popular subject for people to write to the Ministry of Defence saying 'please could you release this file, or papers that you hold on this particular case'.
"What they've decided to do is to be totally open and to say, 'look we're not holding any secrets back about this subject we've got all these files and we're going to make them available to the public'."
One includes details on "aerial phenomena" prepared for a meeting of the Cabinet Office's Joint Intelligence Committee in April 1957.
According to a note included in the Red Book, the weekly intelligence survey, four incidents involving UFOs tracked by RAF radars were "unexplained".
'Spaceman' The documents also include reports of a famous incident dubbed the "Welsh Roswell" in 1974, where members of the public reported seeing lights in the sky and feeling a tremor in the ground.
Other cases included in the files are:

  • A near-miss with an "unidentified object" reported by the captain and first officer of a 737 plane approaching Manchester Airport in 1995.
  • A mountain rescue team called to investigate a "crashed UFO" in the Berwyn Mountains in Wales in 1974.
  • Attempted break-ins at RAF Rudloe Manor in Wiltshire - sometimes referred to as Britain's "Area 51" - the US's secretive desert military base.
  • The Western Isles incident, when a loud explosion was reported in the sky over the Atlantic in the Outer Hebrides.
  • The 14-minutes of "missing" film relating to the Blue Streak missile test launch in 1964, believed by some to show a "spaceman".
  • A gambler from Leeds who held a 100-1 bet on alien life being discovered before the end of the 20th Century, and who approached the government for evidence to support his claim after the bookmakers refused to pay out. The MoD said it was open-minded about extra-terrestrial life but had no evidence of its existence.
The files come from more than 5,000 pages of UFO reports and letters and drawings from members of the public, as well as questions raised by MPs in Parliament.

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