27. Lightning & Sound
If you’ve ever watched lightning crashing and the sound of thunder on a windy, rainy night, then you would’ve noticed how the sound of thunder comes much later than the lightning strikes.
That’s because the speed of light is way faster than the speed of sound. In fact, counting the second in between a flash of lightning and the sound of the thunder can help you calculate how far away the lightning is.
Apparently, a three-second delay means the lightning struck around 0.6 miles away from where you are!