Three things to know:

The Mona Lisa and Kim Kardashian have something in common, and it’s more than just a bewitching smile. Robert Frank, economics professor at Cornell University, says the secret ingredient to success isn’t just hard work and talent.

What’s your favorite color? If the answer is "blue," it’s a bit uninspired. But don’t worry, everyone else says the same thing. We explain why.

Still freaking out about running into your high school teacher in Paris? Turns out, coincidences are more likely than you might think. Joseph Mazur uses math to explain why, but insists that your coincidence story is still “magical.”