The Jewel Caterpillar--probably, though it hasn't been formally confirmed, an Acraga coa, belonging to a family of moths known as Alceridae--is sometimes known as a "slug caterpillar" due to gooeyness. This one was photographed near Cancun, Mexico. [via BoingBoing]
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.