Where are the aliens?

One of the world's greatest physicists, Enrico Fermi, asked why we don't see solid evidence of aliens everywhere. The question, it turns out, runs deeper than you might expect...

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The Wow! signal: the most important UFO?

Here, I discuss the best evidence for alien contact and why most people have never heard of it.

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Why are people different colours?

We evolved in Africa, so why did some human populations become pale?
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