A reader writes:

This is my friend, Ira Klotzko, he’s got a doc. in Physics and a great sense of humor.

I won’t share his original plan for the depiction of Uranus…

One we can share is how he jokes that the tattoo is really accurate because, as is the case with his waistline, the universe is always expanding.

Into the science tattoo hall of fame it goes…

Originally published August 9, 2007. Copyright 2007 Carl Zimmer.