Share your knowledge, teach me something?

Yep, this question is wide open. Teach me something, anything you find interesting.

The site is so full of editorialized opinions, and you know what else. Yet there are many of us who want to learn. Not just about each other, and the opposite gender, but about the world, life. So those are your only requirements for this question. Share your knowledge, on any topic (other than sex and the superficial.) Bonus points for science, technical, philosophy, sociology, etc.

... but this is funny. And it came to mind. Which contradicts what I just said, a little bit.
It's word association. Don't get too sidetracked here. But here's a little eye candy anyway...
Share your knowledge, teach me something?
Share your knowledge, teach me something?
No, let's get serious here.

This is more what I'm after. I want to know what this guy knows, has seen, experienced.
Dave Gandy
Dave Gandy
Share your knowledge, teach me something?
Share your knowledge, teach me something?
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