If you've ever considered getting a tattoo but have been put off by its permanence - who knows how you'll feel about that "E = mc2" face tattoo in 10 year's time? - then a new startup called Ephemeral has you covered. The fledgling company, run by a team of New York University graduates, is developing a special kind of tattoo ink that disappears in just one year.

Basically, after a year has passed, the tattoo starts to fade, and you have the opportunity to either adapt the original design or simply get rid of it. Oh, and current tattoo artists won't need specialised equipment to use the new ink, so if this stuff makes it to market, it shouldn't be too hard to find.