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Android, and Echo devices. Hey, smarty pants. Have you ever seen a disaster movie?

It could be a movie about an earthquake or a sinking ship or a tornado or the much rarer shark

NATO. But here's when you probably haven't seen. Take it away, movie announcer guy.

Imagine a world where bridges didn't exist.

Oh, no, we're headed towards the river and the bridge is out. What's a bridge? I know,

you probably wouldn't just drive into the river, but getting from one place to another would be far more difficult.

Bridges are extremely useful, and they're usually taken for granted, but they can be pretty awesome,

both in size and appearance. Some are even famous worldwide, like San Francisco's Golden Gate Bridge,

New York's Brooklyn Bridge, the Sydney, Australia Harbor Bridge, and London's Tower Bridge.

Some bridges are famous for having one of a kind features, like the bridge with a glass

floor so you can see below you. Or the bridge shaped like a dragon that breathes fire.

There are terrifyingly high rope bridges that sway in the breeze.

Creaky old wooden bridges endanger a falling apart. And of course, dark deserted bridges with

trolls living underneath them. Who's that tripping out of a mind bridge?

So where are these bridges? How do they stay up? Why do they bounce and sway?

And do any of them actually have trolls? Now I'm coming to go for you up!

It's time for another whiff of science and history, on...

Hello, smart egg! Who's smarted?

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