Physics:Newton's Apple（26）
On this special edition of Newton's Apple, we would be answering all of your questions about water, from how to make water drinkable to how do a water tower work. And every living thing requires it, some plants need a lot of water. How do you get the bad things out of the drinking water? To find out, David is with biology teacher Patty Simpson who's created an underwater world representing some bad things that we don't want in our water.
- Added：2006
- Country：America
- Duration：30
- Time of update：2011/3/11 15:03:55