First author Yasser Khan holds the sensor, which is made of an alternating array of printed LEDs and photodetectors that can detect blood-oxygen levels anywhere in the body. (Courtesy: Yasser Khan, ...

The bane of 3D printing is what people commonly call bed leveling. The name is a bit of a misnomer since you aren’t actually getting the bed level but making the bed and the print head parallel. Many ...

One of the striking things about the Juno probe, I remarked to one of its creators, is its simple and streamlined design — compared to other spacecraft, at least. The engineers had a hell of a time ...