10 Things We Still Don't Know About The Human Body (10 pics)

Stupid questions, many of which actually have answers.
Better questions:
1) why do we sleep?
2) why do we dream?
3) why do we yawn, and why is it catchy?
4) what is deja-vous

There are a ton more interesting unanswered questions than these.

Erm, fingerprints are there to provide grip

Many of these questions take many years to be answered.

Quote from AC on top of post:
'Still, there are things we don't know and these are 10 of the most important questions we can't answer.'

One of the questions:
'Does the brain remain active following decapitation?'
- the only people who would believe this to be one of the big questions about the human body, are murderers, crazy people, cannibals (anybody who would willingly kill another).

I would deem big questions like these:
Why do we age? (if they discovered the answer, they probably wouldnt tell....)
Why do we get cancer? (some ways we get it are known, others not)
How does the brain work? (only know very basics)
What is the placebo effect, and how to control it? (this could be a cure-all if researched enough, not being reseached to a large scale due to no financial gain)