Hi, we've got three stories from Curiosity.com to help you get smarter in just a few minutes.

I'm Cody Gough.

And I'm Ashley Hamer.

Today you'll learn a three second trick that'll stop you from saying something you might regret later.

You'll hear a medieval alarm that protected the

show gun from assassins and you'll learn the story behind 3D printed brains and

why they could be a big deal in the medical world. Let's satisfy some

curiosity. All right Ashley, did you ever do that thing at home where you stick to the side of the hallway

is to stay quiet?

I don't know what you're talking about.

So like in my parents' house upstairs, if I left my bedroom and I'm going on the hallway,

if I walked in the middle of the hallway,

you would hear the boards creaking, not the boards,

but you know, like the floor would kind of creak a little bit.

But he was stuck to the sides

because either they're more reinforced or they're not walked on as often then they would never make a noise

Interesting you never had a system like that I don't think my floors worked that way

Or if they did I never discovered it. Wow. Yeah. Pro tip!

stick to the side of the hallway if you're trying to sneak in or out. There you go.

But don't do it if you're not allowed to. We don't advocate breaking rules on this show. Of course not.

Well today you're going to learn about a medieval security alarm that protected the

Shogun from potential assassin and it works in a kind of similar way. Very different, but kind of similar.

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