You're listening to Bulletproof Radio with Dave Asprey.

Today's cool fact of the day is that we have new 3D electronic tattoos.

There's new kind of 3D printer that draws precise patterns of the electrically conductive

material on your skin, which creates a temporary tattoo-like electronic device.

And other 3D printers print stiff, motionless object type of things.

And the new system uses computer vision to compensate for a moving printing service,

like say the back of your hand as it's moving.

And this research came out of the University of Minnesota in Minneapolis, and they're making

wearable LEDs.

And they first struck a pre-made LED light onto the wearer's skin and drew a circuit around

the bulb using a polymer ink, laced with silver flakes, which allowed the ink to conduct

electric current.

And after about 15 minutes of letting the ink dry, the person with a new tattoo could

keep the LED lit by holding a wireless power transmitter over the printed circuit.

And maybe they could even have a 3D printed battery on there.

They printed moisture sensors, which could be used to monitor sweat accumulation to gauge

your stress levels.

And they stand for at least 2 hours, but you can peel them off when you're done.

Now at first blush, this sounds really cool.

And what I wear something like this for 2 hours to gauge my stress levels during an event

or something, I probably would.

But what is missing from research like this is the fact that your skin, your mitochondria

...