Without the benefit of his own kidney stones, he did the next best thing: 3D printed a model kidney, collected some urine, and tossed a few stones that he’d collected from patients into the trap.

In 1843, William Rowan Hamilton had a four-dimensional flash of insight that still shapes our three-dimensional world.

Kidney stones are hard objects made from chemicals in your pee. They may be as tiny as a grain of salt or as big as a corn kernel. The stones can be brown or yellow, smooth or rough. They're a ...

Most of our 3D printers print in plastic. While metal printing exists, the setup for it is expensive and the less expensive it is, the less impressive the results are. But there are other ...

Converting images into vector graphics or creating vector graphics is particularly useful if you need graphics for logos, illustrations, or print templates. While conventional image formats such ...

You’ve probably heard of painful kidney stones. Find out where else “stones” can appear in your body, and how to tell. Sudden, intense pain is the hallmark of a kidney stone. See pictures of ...

Today's affordable 3D printers will likely surprise you: You can get a smooth-working machine with useful features once found only in high-end models. Starting at just $250, these are the top ...

More affordable than ever, 3D printers are booming for personal, professional, and educational use. Here's everything to know before you buy one, along with the top models from our hands-on testing.

Donald Trump ally and political strategist Roger Stone thinks Republicans should use their own "armed guards" to settle election disputes in 2024. “We did nothing in 2020,” Stone said.

Hot stone massage is a form of therapeutic massage in which a practitioner places warm stones on a person’s body or uses them to apply pressure to specific points. Supporters of hot stone ...

Direction is important in describing forces and velocities, but Hamilton was also interested in 3D rotations ... For this is what Hamilton named a "vector." Hamilton defined two ways to multiply ...