Plus, newly discovered ancient galaxies and the history of ice skating.
 | MICROGRAPH BY ANNE WESTON/EM STP, THE FRANCIS CRICK INSTITUTE, SCIENCE PHOTO LIBRARY
| | Millions of people suffer from long COVID—but why?
New data may help solve this mystery. Using a specialized lab technique, researchers are now testing patients with long COVID for microclots in their blood.
“We’re very early,” says David Putrino, a rehabilitation and long COVID scientist. But out of the few dozen samples they’ve tested, 100 percent had microclots.
Read the full story here.
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 | MICROGRAPH BY CHANTELLE VENTER AND RESIA PRETORIUS
| | A fluorescent warning: Long COVID microclots are more difficult for the body to disintegrate (above, microclots in healthy blood, left, and a severe microclot in a long COVID patient, right). Although they can’t block arteries or veins (like the clot at top), microclots can block the supply of oxygen to organs and tissue. Read more.
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 | | PHOTOGRAPH BY CHRISTOPHE PITIT TESSON, POOL/AFP/GETTY IMAGES | | | |
 | | IMAGE BY NASA, ESA, CSA, M. ZAMANI (ESA/WEBB) | | Finding ancient galaxies: NASA’s James Webb Space Telescope has only been operational for six months, but it’s been busy. Already it has broken the record for farthest galaxies ever seen. These new galaxies are only 300 to 400 million years old and present new mysteries of the early universe, Nat Geo reports.
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 | | PHOTOGRAPH BY JOHN LAUNOIS, NAT GEO IMAGE COLLECTION | | Glide on: Even in ancient times, early civilizations used to ice skate. They strapped animal bones to their feet to cross frozen terrain. Modern ice skating likely started in Holland and then spread across Europe via the royal and elite. Canadians, like the nuns above in Quebec City, can take pride in inventing hockey in the 19th century.
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 | | PHOTOGRAPH BY BECKY HALE | | Lassie, reverse aging! Scientists are incredibly good at delaying aging in common lab animals. Now they’re turning to canines in hopes that their similarities to humans—from their lifestyles to ailments—will lead to anti-aging breakthroughs for people, Nat Geo reports. (Above, Ace is examined as part of a new gene therapy trial.) Worst case scenario? Fido gets a few more years.
Related: Can aging be cured? Scientists are giving it a try
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| This newsletter has been curated and edited by Jen Tse, Sydney Combs, and David Beard. Have feedback? Email david.beard@natgeo.com. Thanks for reading and have a great weekend! | | | |
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