The PopSci booth is hopping here at Maker Faire Austin. Here's Gray Matter columnist Theo Gray doing a version of his "dry ice cream"—this time by simply pouring liquid nitrogen into a pot of cream and sugar. Who needs an ice cream maker? Mmm mmm good.
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.