The Daniel Tiger character is supposed to be the son of Daniel Striped Tiger, the shy and beloved puppet from "Mister Rogers' Neighborhood" and the character in the original show that most aligned ...

For decades, researchers have said that our mammalian ancestors were solitary but a new analysis turns that thinking on its head, suggesting they were far more sociable than was previously thought.

Our ability to communicate using words and gestures - how far back does that go? A new study involving chimpanzees suggests it goes back millions of years. Here's science reporter Ari Daniel. ARI ...