Just for fun: XKCD

If you spend any time on science blogs, chances are you've come across the work of xkcd. The xkcd empire includes exceptionally sharp critiques of math, science, and nerd culture.

There are cartoons (and don't forgot to hover over them for extra content).




Including what may be the best cartoon of all time:





A 'What If' page where hypothetical physics questions are answered (did you know how many giraffes high a person can throw a ball?).





And a twitter feed that offers a host of interesting numbers and measurements:

6.5: Mass, in grams, of a kilometer-long strand of human hair
— What-If Numbers (@whatifnumbers) May 1, 2013