65 million years ago The dinosaurs
die off, most likely from the effects of a
giant asteroid smacking into
the earth. Mammals can
now begin to flourish.
Quick Study: Saving Endangered Species Good news: The bald eagle and the gray wolf are back from the brink of extinction. Bad news: That leaves chimps, manatees, polar bears, whales ... Which ones can be saved, and how?
Quick Study: Where Our Garbage Goes In a calm stretch of the northern Pacific lies the Eastern Garbage Patch, a stew of trash twice the size of Texas. Deadly for ocean life, the icky area holds some of the two billion tons of waste we create each year. While technology offers hope for more enlightened disposal, the clock is ticking: Garbage will double by 2030.