Live Science

What's Hot This Week Superwomen: Moms of Twins May Live Longer by Stephanie Pappas Having two babies at a time is associated with a longer life, according to a new study. But that's not because doubling up on dirty diapers increases life span; instead, moms of twins are physically stronger in the first place. Best Illusion of 2011 Reveals Visual Quirk by Wynne Parry A mysterious illusion that illustrates how motion can render color changes invisible won the "Best Illusion of the Year" for 2011, and it also taught researchers something they didn't know. Sponsored by: Pooh, Peter Rabbit & Clifford: Males Dominate Children's Books Gallery: Seals of the World Penguins' Oxygen Trick: How They Survive Deep Dives Eye Tricks: Gallery of Visual Illusions Into the Blue: The Ocean's Deepest Divers (Infographic)