YT:
Shawn Frayne, winner of a 2007 Breakthrough Award from Popular Mechanics, demos another one of his inventions: a self-sealing valve used on a solar disinfection bag
4 years 4 months ago • 5,137 views 4 years 4 months ago • 5,137 viewsplaylists with this video:
who voted for this video:
who bookmarked this post:
Have your say...