I calculate that the electrons in radiation therapy hit you at 99.8% of the speed of light, and the beam used in a 90-second

gamma ray therapy session could, if fired with less precision, kill a horse (they did not let me test this).

::Plurk Frontpage Promotion::

that is probably the most badass thing i've ever seen that also made me want to cry a little.

This and the lego house (parts: 659) are two of the more awesome non-outright humor strips that I love

define kill a horse

I always love it when xkcd mixes a little Serious with his Hilarity.