Cats purr for all kinds of reasons, including communication and healing themselves. In this fascinating feline episode of How Stuff Works, Cristen explains how purring works and which cats can’t do it.
Bees pollinate around one third of our food supply. If bees disappeared, then one third of your food would disappear with them. You would lose that yummy honey that is either eaten raw or in so many scrumptious sweets.
Can I See the Stuff Astronauts Left on the Moon? - Astronauts left over a hundred items on the moon's surface. But are today's telescopes powerful enough to see what's there? Find out in this BrainStuff video.