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Scientists believe some heavy elements are forged when a massive star goes through its death throes and explodes as a supernova. Here, the supernova Cassiopeia A was captured in a false-color image from NASA. NASA/JPL-Caltech/STScI/CXC/SAO, Animation: NASA/JPL-Caltech/Univ. of Ariz./STScI/CXC/SAO/NASA hide caption
A man who is paralyzed was able to type with 95% accuracy by imagining that he was handwriting letters on a sheet of paper, a team reported in the journal Nature. Science Photo Library/Pasieka/Getty Images hide caption
Anti-vaccine advocates are using the COVID-19 pandemic to promote books, supplementals and services. Emilija Manevska/Getty Images hide caption
For Some Anti-Vaccine Advocates, Misinformation Is Part Of A Business
Newly deposited dirt sits on top of a levee at the Eden Landing Ecological Reserve that protects the eastern edge of San Francisco Bay. Lauren Sommer/NPR hide caption
A sign at Michigan State University directs people to a vaccination site. The university is one of an increasing number to require on-campus students to be vaccinated. Anna Nichols/AP hide caption
Pediatricians Work To Persuade Parents And Teens To Get COVID-19 Vaccine
This 16-year-old got a Pfizer-BioNTech COVID-19 shot late last month at the UCI Health Family Health Center in Anaheim, Calif. Students as young as 12 are now eligible to get the vaccine, too, the FDA says. Paul Bersebach/MediaNews Group/Orange County Register via Getty Images hide caption
Ash the cat selects the Kanizsa square stimulus — in other words, the illusion of a square — in a new study in which pet owners provided the data. Tara McCready hide caption
Cats Take 'If I Fits I Sits' Seriously, Even If The Space Is Just An Illusion
Carlene Knight, 54, is one of the first patients in a landmark study designed to try to restore vision in those who have a rare genetic disease that causes blindness. Josh Andersen/Oregon Health & Science University hide caption
Blind Patients Hope Landmark Gene-Editing Experiment Will Restore Their Vision
A dose of Pfizer-Biontech Covid-19 vaccine is prepared in a pharmacy. Ivan Romano/Getty Images hide caption
The Italian Culture Ministry said the Guattari Cave in San Felice Circeo was "one of the most significant places in the world for the history of Neanderthals." Emanuele Antonio Minerva/Italian Culture Ministry via AP hide caption
A medical professional from UofL Health administers a vaccine to a patient in their vehicle at University of Louisville Cardinal Stadium. Jon Cherry/Getty Images hide caption
Family members and relatives wearing protective gear arrive to cremate the bodies of victims who died of the COVID-19 at an open air crematorium on the outskirts of Bangalore on Saturday. Manjunath Kiran/AFP via Getty Images hide caption
A firefighter administers the Pfizer-BioNTech COVID-19 vaccine at a vaccination center near Paris on Monday. The European Union has signed a deal to buy as many as 1.8 billion doses. Bertrand Guay/AFP via Getty Images hide caption
Scientists once compared the abilities of humans versus canines in tracking a trail of chocolate essential oil laid down in an open field. Though the humans weren't nearly as proficient as the dogs, they did get better with practice. Vladimir Godnik/Getty Images/fStop hide caption
The numerals in the illustration show the main mutation sites of the B.1.1.7 variant first detected in the U.K., which is more transmissible than other variants. Here, the virus's spike protein (red) is bound to a human cell (blue). Juan Gaertner/Science Source hide caption
Is The Variant From India The Most Contagious Coronavirus Mutant On The Planet?
Even after full vaccination against COVID-19, people who have had organ transplants are urged by their doctors to keep wearing masks and taking extra precautions. Research shows the strong drugs they must take to prevent organ rejection can significantly blunt their body's response to the vaccine. DigiPub/Getty Images hide caption
Vaccination Against COVID 'Does Not Mean Immunity' For People With Organ Transplants
Covid-19 patients with difficult breathing are aided with oxygen masks outside Gurudwara. Naveen Sharma/SOPA Images/LightRocket via Getty Images hide caption
"We're tracking it. We're following it as closely as we can. It's just a little too soon right now to know where it's going to go or what if anything can be done about that," a U.S. Space Command spokesman told reporters. Guo Wenbin/AP hide caption
A Baltimore police officer and a healthcare worker stand at the empty entrance to the M&T Bank Stadium mass vaccination site in Baltimore, Md., on April 8. Jim Watson/AFP via Getty Images hide caption
Supply Scarce Abroad, Demand Down At Home: Vaccine Access Is Starkly Unequal
Medical workers wait to vaccinate people at a pop-up COVID-19 vaccination clinic last month in Hollandale, Miss. Spencer Platt/Getty Images hide caption
Owner and founder Jeff Smith in front of what remains of Hourglass' winery and processing facility in California's Napa Valley. He's rebuilding, but wildfires have him rethinking everything about his land and business. Eric Westervelt/NPR hide caption
Deepening Drought Holds 'Ominous' Signs For Wildfire Threat In The West
The bottle of Pétrus 2000 spent 14 months on the International Space Station. It will be sold alongside a "terrestrial" bottle of the same vintage. Christie's Images Ltd. 2021 hide caption