The Dangers of Rocks

Causing disappointment and vertigo left and right

Balanced Rock

at Garden of the Gods park in Colorado Springs, ColoradoEvanS (GNU Free Documentation License)

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.