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If you've ever mistakenly grabbed the Phillips head screwdriver when you needed a flat head, you've probably asked yourself why there are different types of screws.
MYSTERY
The average man produces roughly 525 billion sperm cells over his lifetime and releases, in one way or another, more than one billion of them per month and anywhere from 40 million to 1.2 billion in a single ejaculation.
Reader Brian writes in to ask "Why can you stay on a bicycle when moving, but not when it's standing still?"
Up in the winter sky, water vapor in a cloud condenses into a droplet and freezes into a tiny bit of ice, with the water molecules bonding together as a hexagonal crystalline lattice with a six-fold symmetry.