In quantum cryptography, the laws of quantum mechanics are exploited to send messages with higher security than is possible in conventional cryptographic schemes based on classical physical phenomena. In principle, quantum communication enables absolute security — that is, no adversary can intercept messages or tinker with them. But in practice such unconditional security is not

For the first time, scientists have identified the brain pathway that links a positive attitude toward math to achievement in the subject. In a study of elementary school students, researchers at the Stanford University School of Medicine found that having a positive attitude about math was connected to better function of the hippocampus, an important

In the original Star Wars film, R2D2 projects an image of Princess Leia in distress. The iconic scene includes the line still famous 40 years later: “Help me Obi Wan Kenobi, you’re my only hope.” BYU electrical and computer engineering professor and holography expert Daniel Smalley has long had a goal to create the same

Because of their high precision and speed, Delta robots are deployed in many industrial processes, including pick-and-place assemblies, machining, welding and food packaging. Starting with the first version developed by Reymond Clavel for a chocolate factory to quickly place chocolate pralines in their packages, Delta robots use three individually controlled and lightweight arms that guide

An unfortunate church dinner more than 100 years ago did more than just spread typhoid fever to scores of Californians. It led theorists on a quest to understand why many diseases – including typhoid, measles, polio, malaria, even cancer – take so much longer to develop in some affected people than in others. It’s been

3-D scanning using a dip scanner: The object is dipped in a bath of water (left) by a robot arm. The quality of the reconstruction improves as the number of dipping orientations is increased (from left to right). Credit: ACM An international group of researchers developed a technique that results in more accurate 3-D scanning

The 3,700-year-old Babylonian tablet Plimpton 322 at the Rare Book and Manuscript Library at Columbia University in New York. Credit: UNSW/Andrew Kelly UNSW Sydney scientists have discovered the purpose of a famous 3700-year old Babylonian clay tablet, revealing it is the world’s oldest and most accurate trigonometric table, possibly used by ancient mathematical scribes to

A disturbance branching out with time, and at long time is localized on a field pattern. One may think of currents flowing along these lines and branching. Credit: Ornella Mattei. University of Utah mathematicians propose a theoretical framework to understand how waves and other disturbances move through materials in conditions that vary in both space

Animation of negative differential resistance. Credit: University of Alberta With a storied history that includes more than a half-century of research, a Nobel Prize, and multiple attempts at practical applications, the story of negative differential resistance—or NDR—reads like a scientific mystery, a mystery that University of Alberta physicists have at last succeeded in unraveling. What

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