This is bullet-proof human skin - made from spider silk and goat milk. Yes, really.

This is bullet-proof human skin - made from spider silk and goat milk. Yes, really.: "Jalila Essaidi is testing the limits of human endurance, and it starts by having to milk spider-goats. Spider goats are otherwise innocent-looking goats that have been genetically engineered to produce milk packed with the protein made in spider's silk. (There is no definitive proof that this also gives them a propensity to skitter up walls or hide out in your sock drawer, but I think it does.)

Once the goats are milked, Essaidi spins the protein into fiber that is ten times stronger than steel, and mixes it with human skin.
Basically she's created a fiber matrix of the protein, laced liberally with human skin cells. The result is a composite of human skin that can actually stop bullets, as you can see in this picture below."