History:Newton's Apple（8）
On this episode of Newton's Apple， we shall find answers to three questions: First， how do you clean up a chemical spill? Here is Peggy Knapp with the answer. Second， we will find out why an inlaid skater is so much faster than a roller skater. And third， Why does my skin wrinkle when I stay in a bathtub for a long time?
- Added：2006
- Country：America
- Duration：30
- Time of update：2011/8/19 14:27:47