Everyone, from star singers to stargazers, is getting tattoos. But have you always fancied some ink but never been able to decide what to get?

Look no further than this photoblog, compiled by the prolific science writer Carl Zimmer when he’s not busy filling us in on the rather more important science issues of the day. It’s a veritable gallery of the geeky, including tats of mathematical functions, molecular structures, and even an ECG trace of a heart arrhythmia, all lovingly preserved in indelible Indian ink, presumably as a memento should their wearers ever decide to give up being scientists.

Bonus points go to the brave soul who attempted to turn themselves into a walking version of the entire tree of life. That must have been almost as painful and painstaking as evolution itself.