The kick-off signal for puberty begins in the brain. Specifically, in the hypothalamus, where specific neurons release a ...

Birds do it, and bees do it. Indeed, researchers estimate that over 99.9% of eukaryotes reproduce sexually. What, then, are the true costs and benefits of sex? Yet again, this simple example ...

A boxer crab mother relies on living anemones for defense. See how jungle animal parents raise children by mastering their environment. An orangutan spends eight years teaching her baby the ways of ...

The peak of La Danta—one of the world's largest pyramids—pokes through the forest canopy. "All this was abandoned nearly 2,000 years ago," says archaeologist Richard Hansen. "It's like finding Pompeii ...