Watching the Olympic opening ceremony (looking at the Olympics board elsewhere reminded me of this) - they had a laser generated image of a DNA helix.
Whilst I was watching it, I suddenly had a thought - the symbol used by the medical profession is two snakes entwined about a central staff/knife - exactly the same shape as the double helix of DNA.

Almost certainly a coincidence, but a rather freaky one.

Anyway, add your own "hang on a minute"'s here - no "well, that's obvious" comments please.

I'd tell you some of mine but then the Roving Mods would have to move the topic to PM.