This is strange: to predict how successful your marriage will be, take out an old yearbook picture of yourself. Are you smiling big, just like the class photographer wanted you to do? That's a good indicator that you're not going to get divorced.
Also in today's links: wolves in Montana, allergies to fruit and veggies, and more.
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.