Measuring the speed of light @ Home

Enjoy this great experiment showing how to measure the speed of light using ordinary household appliances.

(SPOILER: This does not involve opening the refrigerator door and waiting till the light switches on.)

10 Things your science teacher was wrong about

Water IS blue, not just because of the sky
Many believe that lakes and oceans are blue “only” because they reflect the blue sky. Actually water looks blue because water is blue; the water molecules do absorb some light, and they absorb red frequencies more than blue. The effect is small, so the blue color only [...]