About six months, I did a story on bulletproof human skin, a transgenic art project created by Jalila Essaidi and the Forensic Genomics Consortium Netherlands.
But does it work? Tune into the testing phase at 3:00.
(Bullet-proof human skin video)
It turns out that their current implementation does not stop a full-seed bullet; however, it does stop a bullet at a lower speed.
As Achilles knows, it's important to have bulletproof skin all over, including your heels. Other (more recent) sfnal examples include skinweave from an old cyberpunk role-playing game, and this similar example from Sos the Rope by Piers Anthony:
"The surgeon placed flexible plastic panels under the skin of his belly and lower back, tough enough to halt the driven blade of a knife or sword."
MIT Computerized Bionic Leg Is Part Of The User
'The leg was to function, in a way, as a servo-mechanism operated by Larry’s brain, through the mediation of the electronic brain in the leg.' - Charles Recour, 1949.
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