No doubt you're an expert on which foods taste delicious and which ones taste disgusting to you. But have you ever thought about why foods taste different? And why is it that other people sometimes love foods you hate?
Sample the science behind taste, including how your taste buds help you enjoy the many flavors of food. Then investigate why your tastes may change as you grow older.
All living organisms on Earth share one common ancestor, connected through the process of evolution. What’s evolution? A change in the gene pool over time.
Five processes contribute to evolution, which has continued since life began. Learn a clever way to understand — and remember — how gene pools change.
Toothed whales range in size from dolphins, porpoises, and orcas to sperm whales (at almost 60 feet long and 45 tons). There are about 65 species of toothed whales in the world.
Toothed whales are hunters, unlike the baleen whales that filter food through the baleen plates in their mouths. Also, toothed whales have one blowhole, while baleen whales have two.
Black holes are places where ordinary gravity has become so extreme that it overwhelms all other forces in the universe. Once inside, nothing can escape a black hole's gravity — not even light.
How can we find something that's essentially invisible? And how close is the closest black hole? Take this voyage to a black hole to get those answers and more.