Helium can work against gravity
When liquid helium is cooled to extreme temperatures, just a few degrees away from its boiling point (-460 degrees Fahrenheit), it turns into a superfluid, meaning it can flow without friction, Scientific American reports. It can climb up and over the sides of a glass, and it can leak through molecule-thin cracks in a container.
Another interesting science fact about helium: While it’s the second most abundant element in the universe, it can be harmful to the human body, according to an article in the journal Injury Prevention. So as funny as it may be to suck down some helium and hear your high-pitched voice, it’s best to keep birthday balloons out of your mouth.
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