Featuring Collins Balcombe of the U.S. Bureau of Reclamation- Balcombe's job is to keep your drinking water safe and find new ways to re-use the water that we flush away everyday so that it doesn't go to waste, especially in areas that don't get a lot of rain.

ที่มา :  https://plus.googleapis.com

ลิงค์ : http://youtu.be/znn6TxU6kXI

อัพโหลดโดย : American Chemical Society