The military has used silly strings to detect tripwires in Iraq. Before entering a room, they can squirt it inside. If it hangs in the air, it may have revealed a wire.
100 Mind-Blowing Strings Facts
The Fender Guitar company makes 90,000 guitar strings a day. Fender may be one of the biggest music companies, but its founder, Leo Fender, did not know how to play any instruments.
The Katzenklavier was a piano made out of cats. No, it wasn’t made out of their skin or bones, but it’s still one of the most disturbing WTF facts: Designed in the 17th century by Athanasius Kircher, it was a piano that had a row of caged cats with different pitches. This cat piano would then be played with the traditional keyboard that drove nails into their tails instead of into strings.
Travelling back in time is possible—theoretically, at least. According to Einstein’s theory, you could travel back in time by moving faster than the speed of light, as long as you could somehow have infinite mass. Since that probably won’t work, you could create “wormholes” between two points in space-time. (This would also be tough since humanity still hasn’t invented the technology to build a wormhole.) Or you could try bending space-time by plucking some “cosmic strings.” Two of these theoretical strings, which are thin streams of pure energy that are moving in opposite directions at very near the speed of light, could theoretically warp space-time enough to create a closed time-like curve—also known as a time machine.