I found this to be a really fascinating piece of technology. It is an LED tattoo, which is made of a thin film of silk on which silicon transistors about one millimeter long and 250 nanometers thick are placed. The silk holds the electronics in place and conforms to the biological tissue when implanted inside the body and wetted with saline. The silk substrates are then completely broken down by the body into harmless by-products. Because they are just nanometers thick, the thin silicon circuits left behind don’t cause irritation.
Illuminated tattoos! That sounds really cool!
More info here: http://www.gizmag.com/implantable-electronics/13334/
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