Method of turning dirty water into clean water of ancient Egyptians
In order to have enough water to live in the desert, the Egyptians thought of a special method of water filtration thousands of years ago.Why can't humans trample on bacteria?
Can the bacteria die?UV sterilizing door handle costs 13 USD
Two teenagers from Hong Kong, Sum Ming Wong (17) and Kin Pong Li (18 years old), introduced a convenient door handle design that can kill bacteria with UV at the Science and