Science Times: When Biking and Bears Don’t Mix

Plus: Nobel Prize in Physics Awarded for Cosmic Discoveries —

View in browser|nytimes.com October 8, 2019

Lido Vizzutti for The New York Times   When Biking and Bears Don't Mix Conservationists worry that the popularity of recreational mountain biking and e-bikes in public lands leads to unsafe conditions for humans, as well as for bears and other wildlife. By Jim Robbins

Jonathan Nackstrand/Agence France-Presse — Getty Images   Nobel Prize in Physics Awarded for Cosmic Discoveries The cosmologist James Peebles split the prize with the astrophysicists Michel Mayor and Didier Queloz, for work the Nobel judges said "transformed our ideas about the cosmos." By Kenneth Chang and Megan Specia Jonathan Nackstrand/Agence France-Presse — Getty Images   Nobel Prize in Medicine Awarded for Research on How Cells Manage Oxygen The prize was awarded to William G. Kaelin Jr., Peter J. Ratcliffe and Gregg L. Semenza for discoveries about how cells sense and adapt to oxygen availability. By Gina Kolata and Megan Specia Travis Rector/Gemini Observatory/NSF/AURA   An Interstellar Comet, in Time for the Holidays On Dec. 7, the extrasolar comet now known as 2I/Borisov will make its closest approach to the sun. By Dennis Overbye F. Astier/Centre Hospitalier Régional Universitaire de Lille/Science Source   Brain Stimulation Shows Promise in Treating Severe Depression Years ago, more than two dozen patients received an electrical implant to counter their depression. They're still feeling better, a new study finds. By Benedict Carey

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Takeshi Inomata   Online Map Leads Archaeologist to Maya Discovery Lidar has transformed the study of ancient civilizations, but maps made with the technology are expensive. Takeshi Inomata found a great one for free. By Zach Zorich Esther Horvath for The New York Times   Scientists on Arctic Expedition Choose Ice Floe That'll Be Home for a Year The Mosaic mission has picked the ice floe it will be frozen into for the next year, to learn more about global warming's effects on the Arctic.  By Henry Fountain Scott Olson/Getty Images   The Veterinarian Will See Your Dinosaur Now We asked a pet doctor how he'd treat the fossilized injuries found to have affected some of prehistory's most fearsome reptiles. By Cara Giaimo Allison Farrand for The New York Times   An Astronaut Who Built Paths to Space for Other Women Janet Kavandi, who recently retired from a senior NASA post, went to space three times and added fairness to the astronaut selection process. By Jillian Kramer

First All-Female Spacewalk Is Back On, NASA Says The mission was canceled in March after the agency said it did not have two properly fitted spacesuits readily available. by mariel padilla trilobites What Rolls Like an Armadillo but Lives in the Sea? A scientist studying the defenses of mollusks called chitons thinks these sea creatures might be less primitive than expected. by joanna klein

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HEALTH Brittainy Newman/The New York Times   These Women Say a Trusted Pediatrician Abused Them as Girls. Now They Plan to Sue. State officials stripped Stuart Copperman of his medical license almost 20 years ago. Armed with a new law, his former patients hope to file civil lawsuits. By Roni Caryn Rabin Steve Gschmeissner/Science Source   Global Health Australia Just Had a Bad Flu Season. That May Be a Warning for the U.S. In 2017, a terrible flu season in Australia presaged an American outbreak in which 79,000 died. Experts advise getting the shot soon. By Donald G. McNeil Jr. Larsen et al., New England Journal of Medicine   Lung Damage From Vaping Resembles Chemical Burns, Report Says Doctors at the Mayo Clinic examined samples of lung tissue from 17 patients, all of which looked as if the people had been exposed to toxic chemicals, the researchers said. By Denise Grady Gracia Lam   Personal Health Relief for Children's Migraine Headaches New guidelines for therapies for children and adolescents can reduce or eliminate attacks of migraine and greatly shorten their duration. By Jane E. Brody Science Source   In the Pancreas, Common Fungi May Drive Cancer A new study found that certain fungi can settle in the pancreas, where they spur the growth of tumors. By Knvul Sheikh iStock by Getty Images   The Checkup Is Your Child Struggling in School? Talk to Your Pediatrician A new report advises pediatricians to give academic failure the same attention as any other complex problem affecting a child. By Perri Klass, M.D.

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Addicted to Screens? That's Really a You Problem Nir Eyal, who wrote the industry manual for hooking people on tech, now has a recipe to free you — even though it was your fault to begin with. by nellie bowles Twin Births in the U.S. Are Dropping, and Experts Have a Theory Researchers believe that the decline may be connected to advances in embryo transfers during in vitro fertilization. by christine hauser retiring Medicare Shopping Season Is Almost Here Every fall, the 60 million Americans who use the health plan can compare options and save money. Here's what to consider. by mark miller Scientist Who Discredited Meat Guidelines Didn't Report Past Food Industry Ties The lead researcher, Bradley C. Johnston, said he was not required to report his past relationship with a powerful industry trade group. by tara parker-pope and anahad o'connor

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