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Five mysteries of the universe

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The things that look so trivial, and so many times go unnoticed, when one begins to question them, it feels strange and maybe even threatening. Or exciting ?-)
clipped from www.guardian.co.uk

Five mysteries of the universe

there are scientific phenomena that defy explanation

1 The missing universe

Everything in the universe is either mass or energy, but there's not enough of either
96% of the cosmos is missing
"dark energy" and "dark matter"

2 Life

Next time you see a tree, ask yourself why that is alive when your wooden dining table is not.

3 Death

Here's the flip side: in biology, things eventually die, but there's no good explanation for it
switching genes on and off controls ageing, but if our theory is right, those switches shouldn't have survived natural selection

4 Sex

almost everything in biology uses sexual reproduction rather than asexual cloning
sex is a highly inefficient way to reproduce
At the moment, sex only seems to exist to give males some role in life.

5 Free will

Neuroscientists are almost convinced that free will is an illusion.
our brains allow us to think we are controlling our bodies, but our movements begin before we make a conscious decision to move.
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