Did you know about all of these mysteries?  Although the topics are well known by science fans, their actual answer remain unsolved!

This video examines these 25:

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.

Here are a few on the list:

What is the universe made of?
Why do we dream?
Why do we even sleep?
Where do we put all the carbon?
How do we get more energy from the sun?

Let’s check out all of the science mysteries in the video on page 2

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