Think of this as an anti-unicorn chaser for the cute baby animals.
This set of 110-year-old condoms, made from the swim bladders* of fish, are up for auction in Vienna. Delightfully, they seem to have been meant to be reusable, as evidenced by the former owner's careful tally of how many times each condom had been used. It looks as though you were only supposed to reuse 10 times.
*Not a "bladder" like what fills up with urine, but, rather, a gas-filled internal balloon that helps fish control their own buoyancy. The other bladder usually is much less condom-shaped.
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.