Physics:Newton's Apple（32）
On this episode of Newton's Apple， we shall find answers to the questions: First， funny thing about a glider， there is no propeller， there is no engine. So how can a glider fly? Second， recently some dentists are using something called "electronic anaesthesia"， it's one of the lastest things that makes a visit to the dentist's office more comfortable. We'll find out something about it in a minute. And last， welcome to this week's Science Try-its.
- Added：2006
- Country：America
- Duration：30
- Time of update：2011/8/16 10:38:13