From Cow Poop to Clear Water
In India, many communities need to clean their dirty water. It's not easy. Many cleaning systems use chemicals and energy. They need workers.
印度有很多人需要淨化髒水,這個工作可不容易。汙水處理系統需要化學物質跟電力,也需要人手。
A man wanted to make a new system. But he didn't want his system to use...
Published 04/25/24
Protecting the Moon from Garbage
Over fifty years ago, the USA sent a rocket to the moon. An astronaut got out and walked! Whoa! How exciting! But after that, not many rockets went there.
五十多年前,美國發射火箭登陸月球,太空人還在月球上漫步。但是在這之後,登上月球的火箭沒那麼多。
Now many countries and companies want to go to the moon....
Published 04/24/24