The mammograms most women receive are decidedly two-dimensional. An x-ray machine takes images of the breast from the sides, and radiologists examine the resulting image to see if it offers up any hits of potentially cancerous irregularities. These tests, however, are far from perfect. Normal calcium deposits and fibrous tissue can align to create a [...]

In yet another instance of science imitating science fiction, researchers are inching toward the sort of three-dimensional "telepresence" technology that Princess Leia used to contact Obi-Wan Kenobi in Star Wars. And whereas Leia’s warning came recorded on a droid, these real-life holograms could one day be broadcast live from one place to another, enabling more [...]

A team of roboticists and computer scientists has created a truly three-dimensional display scheme, with multiple layers of water serving as the display surfaces. Each "screen" comprises a steady stream of water drops, released in carefully timed horizontal rows, so that at any given moment the screen is fundamentally a lot like a regular television [...]

NEW YORK—When ancient denizens of central France painted leaping horses on the cave walls at Lascaux, they might not have had the late Renaissance understanding of how to illustrate perspective and three dimensions. But they did, with simple black lines, give the implication of depth, showing the far pair of limbs behind the closer pair. [...]