Physics:Newton's Apple（12）
On this episode of Newton's Apple， we shall find answers to the questions: First， why do birds sing to one another? Peggy woke up with the birds one morning to listen for the answer. Next， America's most scientific home video contest from Newton's Apple. And last， entomologist Kraig Anderson will tell us about scorpions.
- Added：2006
- Country：America
- Duration：30
- Time of update：2011/8/16 10:19:17