Correlation does not imply causation.
Correlation does not imply causation.
Correlation does not imply causation.

There. I did my job, Hank.

DFTBA

I had always thought speed = velocity, but I was thinking of instantaneous, not average.
http://www.physicsclassroom.com/class/1dkin/u1l1d.cfm

It's lucky that Fritz Lickint and Richard Doll didn't know this. In fact, as stated, Green seems to be denying that epidemiology can ever be of any use!

Now if he had said correlation does not necessarily imply causation, or that it doesn't prove causation, I'd agree 100%... finding a correlation isn't the end of a study but it could be the starting point for one, and often has been.

Oh, and to save anyone else looking this up, the speech bubble given to Tereshkova "первый!" does indeed mean "first!" (at least according to google translate, but it doesn't seem to know gender).

The Bald Eagle call has always been a pet peeve of mine. So I'm a little peeved that he still didn't manage to play a Bald Eagle call - at least not a "normal" northwest bald eagle call. Seriously, what the heck was that? Regular bald eagles: http://www.allaboutbirds.org/guide/bald_eagle/sounds

Where's John?

"Correlation doesn't imply causation, but it does waggle its eyebrows suggestively and gesture furtively while mouthing 'look over there'."
- Mouseover text of http://xkcd.com/552/