A Theridion Grallator, also known as a "happy face" spider, in Hawaii. These spiders are about five millimeters long. Their patterns may change depending on the food they've eaten, serving as potential protection against birds' pattern recognition capabilities (bird are their only predators).
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.