Yesterday--at least in the northeast U.S.--was a picture-perfect, sun-shiney day. But as many of us took a few extra minutes at lunch to soak up one of the first nice spring days of the season, the sun overhead was in the midst of some serious violence. At roughly 1:45 p.m. EDT yesterday, a huge and beautiful eruption took place on the east limb of our local star, sending a massive prominence looping out into space.
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.