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Sliding a big rock down the ice may look simple, but there’s much more to the sport of curling. Sweepers heat up the pebbled ice, causing it to melt and reduce friction, but the rotation, speed and pressure are equally important. The Olympics may be over, but the physics of curling has me hooked!
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Eye color depends on two layers in your iris, the colored part of your eye. The epithelium is the back layer and can show through as dark specks. The front layer is the stroma. If it contains lots of melanin, your eyes are brown. Excess collagen makes them green. Blue eyes have neither!
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