Uhoh YouTube: Most systems and machines people design break from time to time. That also applies to the United States' nuclear weapons. This video was originally published in June 2015.

posted by PlayhousePals 3 years 6 months 1 week ago • 920 views • 3:50

YouTube: Used in everything from bullet-proof vests to the walls of the Pentagon, polyurea's strength comes from its long-chain molecules.

posted by PlayhousePals 3 years 7 months ago • 1,626 views • 7:09

"... buckyballs are all around us." YouTube: In 1985, scientists discovered that 60 carbon atoms could join up to form one big soccer ball shape: a buckyball! It’s a strange little molecule.

posted by PlayhousePals 5 years 1 month 2 weeks ago • 22 views • 4:47