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Have you ever inhaled helium out of a balloon? We’ve all done it at least once in our lifetime. Your voice gets super high pitched and squeaky for a couple of seconds, you gotta keep inhaling through the balloon though, it doesn’t last very long. It’s a fun party trick, and it’s all thanks to Helium, which is much lighter than Oxygen. Because of that, Helium travels quicker through your vocal cords, making them vibrate faster.

But what if helium replaces oxygen? Well, a little bit of Helium isn’t harmful, not when you’re inhaling it through a balloon with almost no pressure. But a whole atmosphere of helium!? Everyone starts running around, shouting in high squeaky voices. It’s pretty entertaining, but also kind of terrifying. Your ears start to feel a bit funny, and it sounds like someone’s revving a motorbike inside your head. You need Oxygen to balance out the air pressure inside your ear. And since the atmosphere is now filled with Helium for some reason, your body can’t maintain that balance...

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