In poker, it matters what cards you have. But it also matters if you can manipulate your opponent into thinking you have better cards than you do. Or you can remain enigmatic with a "poker face." That's all because you are bound to win some and lose some according to the cards, but how much money everyone bets is even more important, and can be manipulated with skill. Of course, you could always cheat, but that could get you killed. But honestly, winning fairly could get you killed, too, when the stakes are too high. No one is more frustrated than a man who has just lost his family farm, which he wouldn't have wagered if he weren't drunk. There's nothing more dangerous than an armed drunk loser. So practice your poker face, but never play for stakes that will ruin someone's life. This TED-Ed lesson explains how we got poker and why it's so alluring to gamblers. -via Damn Interesting