A new online tool, called iBatsID, will help researchers classify and track various bat species across Europe. Looking at bats offers key information about biodiversity. "Bats are like a heart monitor for the environment," said Charlotte Walters of the Zoological Society of London. "If bat populations are declining, we know that something is wrong." NEW YORK TIMES Phew! Killer asteroids aren't in your future If you're worried about a killer asteroid wiping out Earth, NASA has some good news. The space agency said Thursday that it has identified more than 90 percent of giant, potentially Earth-threatening asteroids, including some as big as the one thought to have killed the dinosaurs. "We know now where most of them are and where most of them are going. That really has reduced our risk." Photo: Wide-field Infrared Survey Explorer, which is tracking huge asteroids