Next time you take your temperature, maybe think twice about its accuracy. Despite what the mercury says, not all of your cells are really at 98.6 degrees, scientists reported in a new study. Using nanoscale thermometers, researchers have shown for the first time that living cells can exist at different temperatures. Busy sections are warmer, and less-active ones are cooler.
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.