Professional Humor
Here is a good sign, XKCD just ran this comic, which, in 4 years will officially be considered “professional humor” to me. 
Alt text: “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)”
Heidi has those tattoos for the very same reason… I’m sure she would prefer others.
I’m glad we live in a world where some tattoos and a relativistic particle cannon can be of such help to our loved ones! 8 score year ago the best treatments would have involved echinacea and prayer.