Bird Migration
How do birds know when to migrate? (They watch day length, and then wind conditions.)
How do birds know when to migrate? (They watch day length, and then wind conditions.)
What causes hair to turn gray? (Toxins build up and kill the pigment cells in the hair follicle.)
People whose bowls kept filling up with more soup ate more, and fans of a winning team are more …
Analyzing colored carrots for phytochemicals, and a compound in grapes inhibits a cancer enzyme.