Depressingly, Mother Jones already created a map of mass shootings in America the last time we had one, so it was all ready to go when news of this morning's shooting in a Connecticut elementary school broke. By their tally, there have been 61 mass murders in the past 30 years. It's important not to forget them. See the map here.
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.