history

"Those who don't know history are doomed to repeat it. And those who do know history can laugh at those who made it."

Life looks a lot different now than it did even twenty or thirty years ago. As recently as fifty years ago, even scientists had a hugely different idea of how the world worked. And a hundred years ago? Screw that, no one wants to live in a world without functioning toilet paper or high fives. On the flipside, there's also tons of stuff that's way older than people think.