Here is the non-scientific, fantasy explanation of what's going on in this video: Scientists have discovered a way to breed a ball bearing with Silly Putty.
Here is the scientific answer: Researchers from RMIT University call these little marvels "liquid metal marbles," and they're drops of liquid metal with a nanoparticle coating. They're both heat- and impact-resistant (see above), and researchers say their conductive cores could be used for flexible electronics in the future.
That is, if the researchers, unlike me, can stop watching this video.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.