Science A 13,600-year-old mastodon skull is unearthed in an Iowa creek The University of Iowa’s Office of the State Archaeologist said a 12-day excavation yielded “several mastodon bones,” primarily from the skull. Mastodons are distant cousins of elephants. Joe Hernandez
Science What to know about the 'slapped cheek' virus uptick in the U.S. Most healthy people have either no symptoms or flu-like symptoms from a parvovirus B19 infection, but it can lead to serious complications for certain groups of people. Juliana Kim
Environment How one pop band is trying to turn concertgoers into climate activists The multi-platinum-selling indie pop band is using research to inspire fans to take immediate action against climate change. Chloe Veltman
Science Giant panda Ying Ying gives birth to twins The giant panda Ying Ying in Hong Kong is now the mother of twins. The theme park where she lives said the birth is a “true rarity” — because Ying Ying is the world’s oldest first-time panda mom. Gurjit Kaur Christopher Intagliata
Environment Water treaty between Mexico and U.S. faces biggest test in 80 years The water-sharing systems between Mexico and the U.S. are facing one of the biggest tests in their 80-year history after Mexico has fallen behind on billions of gallons of water deliveries. Bria Suggs
Environment To save wild crocodiles in Australia, scientists gave them food poisoning Freshwater crocodiles die every year in Australia from eating poisonous cane toads that humans introduced to the continent. Now scientists have found a way to teach the crocs to avoid the toxic toads. Ari Daniel
Science Certain bats have no health issues with sugar. Can bats teach us about diabetes? Bats are able to consume an extraordinary amount of sugar without getting sick. Scientists are trying to learn more about how bats do it, and if they have something to teach humans. Ari Daniel
Environment To heal the Gulf of Mexico's dead zone, we have to look north to Midwest farms There’s a massive area in the Gulf of Mexico that’s so low in oxygen, aquatic life can’t survive there. Many say it’s mainly from excessive fertilizer that runs off from Midwestern farms. Eric Schmid
Science Researchers say they've found the surprising source of a key piece of Stonehenge Researchers may have solved a Stonehenge mystery — and raised another. They say its central Altar Stone somehow got to England from Scotland, hundreds of miles farther away than originally thought. Rachel Treisman
Science Saving freshwater crocodiles — by teaching them to not eat poisonous toads Thousands of freshwater crocodiles die in Australia each year after eating poisonous cane toads. A team of researchers is trying to teach the crocs to avoid the toads, and it appears to be working. Ari Daniel
