"Tattooing by prehistoric people in the Southwest is not talked about much because there has not ever been any direct evidence to substantiate it" — until now.

The tattoo removal gun features a YAG laser ... This reduces the power density, and allows the tool to weld various materials even on its lower power settings. Success was found welding steel ...

Therefore, [Emily] ingeniously modified one of her standard 3D printers to operate two-dimensionally, swapped its plastic extruder for a tattoo gun, and, yes, even managed to persuade a willing ...