Silly Putty
You can stick it to your hand. You can copy and paste newspaper print. Or you can just goop it around. Silly Putty is the perfectly moldable semiviscous, semirigid material that was such a smash in the ’60s, it was even taken aboard the Apollo 8 spacecraft in 1968. And its origin story is as fluid as the material itself, with many inventors fighting for and claiming credit.