15 Unsolved Scientific Mysteries That Will Leave You Scratching Your Head

From the composition of the universe to why giraffes have such long necks these are 25 unsolved scientific mysteries that will leave you scratching your head.

#15. What is the universe made of?

Atoms, the building blocks of everything around us, only account for 5% of the total matter in the universe. The other 95% has come to be called dark matter and dark energy. Apart from giving the mystery matter a name, though, not much is known about it.

universe

universe

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