If you're tired of fretting about swine flu, here's something else to think about: dislodged "ear rocks" -- loose crystals made of calcium carbonate that can cause dizziness. These little guys are usually valuable, helping us stay balanced, until an injury or virus triggers a "rock slide."
Also in today's links: a levitating air conditioner, horse surgery, 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.