Michael Pritchard talks about his invention: the Life Saver bottle which turns dirty water into drinkable one.
Such a big invention. And if this idea is not worth spreading, I don’t know which else is.
By the way, the subtitle of this video is set as “French”. One of my pleasures in learning languages is to watch a video in a foreign language while reading its subtitle in another foreign one. That pleases the language geek inside of me.