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.”

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Originally published February 17, 2008. Copyright 2008 Carl Zimmer.

Kristin writes, “This was a graduation present to myself. It came to me during a genetics lecture and I got it done 3 years later. It goes ankle to mid thigh. I’m a geneticist now and LOVE it. Genetics stole my heart. P.s. It codes for a snippet of an exon from the sonic the hedgehog gene.“

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Originally published February 16, 2008. Copyright 2008 Carl Zimmer.