The May issue of mental_floss magazine (on sale today) is full of secrets. Like Laura Palmer’s diary. Or a locked treasure chest. You know, full of jewels and stuff. (And secrets.) You can find it at your local newsstand or jump the gun and subscribe right here.

In it we reveal: one bedroom pro-tip (and some interior decorating advice) from the octopus, what it’s really like inside a nuclear power plant control room, who invented the selfie, and why Henry David Thoreau deserves the credit for the number 2 pencil. (It’s not for the reason you think! Wait, what do you think?)

Oh, and here’s one more secret: if you click here you can get a free copy. Shhhh. You didn’t hear it from me.