Polar bears can't bear to be locked up in zoos because it's in their nature to roam long distances.
Exercising while doing certain cognitive tasks can actually improve performance.
They don't have vocal chords, but caterpillars use sound to try to scare off intruders.
In 2007, a Dutch schoolteacher discovered green ghostly structures surrounding distant galaxies that he dubbed "voorwerps."
Not unlike Tarzan, male orangutans belt out warning calls to indicate their whereabouts while tree-hopping.
A fetus can recognize its mother's voice; when it hears her, its heart rate accelerates.
Hummingbirds appear to hover effortlessly midair. Here's how they create the illusion of floating in the sky:
Measuring data from the Hubble telescope, NASA has discovered a salt-water ocean on Jupiter's largest moon beneath layers of ice.
Human footprints from 350,000 years ago have been preserved in volcanic ash.
Alcoholic beverages may make you drowsy, but actually reduce your quality of sleep.