#23: Disgusting Dust
I’m going to warn you now: this is a fact that you might be happier not knowing. If you are not sure if you’re ready for this fact—especially if you’re concerned with cleanliness—it might be all for the best if you just skip ahead to the next fact. I won’t judge you.

If you stuck around, I hope you enjoy knowing that you are surrounded by skin cells: yours and others. When you dust off the piano, you are dusting off skin cells. When you accidentally inhale some of that dust, you are inhaling skin cells. And not just yours—everyone else’s, too.