Earlier this year, 19-year-old Alex Yurkiv was killed in a motorcycle accident in Australia. His name isn't well-known, but he co-wrote a Christian song that's been played more than 30 million times.
NPR's Juana Summers talks with Regina Barber and Jessica Yung of Short Wave about carnivorous squirrels, the history of life on Earth, and new insights into the relationship between people and dogs.