If you did the math and applied physics, you would find that Santa has approximately 223 microseconds per household to deliver his gifts. That’s not much time. So it’s up to us parents to make sure stockings are stuffed. And if you are a geeky household you’ll love that we’ve calculated the top stocking stuffers for science lovers. We’ve gathered ideas for tiny treats that exercise a big muscle—the brain! These toys and puzzles push creativity, test dexterity, and get mental gears spinning.