What's one thing that is literally impossible for humans?

[Anonymous]

[Soteris]

This is a phonetic alphabet chart, more specifically a part of it that shows consonants, it displays roughly which "sounds" a human can make. More interestingly though, it shows us what we should technically be able to do as well as some sounds that are impossible for us. The empty white boxes represents sounds we can make but has never been found to exist in human language and as such, does not have a symbol.

The greyed out boxes however, are the sounds currently believed to be impossible.

On an interesting side note, the symbols here represents every consonant in every language ever documented in human history. Every language on earth use these sames sounds (although each language often only uses a handful of these each). There is surprisingly little variation when you think about it.

[NathanDavis]

if you're wearing ADIDAS... nothing...

[petitedollbabee]

Flying or breathing underwater without the help of devices, machines or other man made things.

[purplepoppy]

Lick your own elbow.
Not look at a £50 note her up.

[Dargil]

Flying, unaided.