A donut is not a bun. From a mathematical point of view, they are two fundamentally different objects: The donut has a hole, the bun does not. A circle inside the donut around its hole in the center cannot be shrunk to a ...
Optics & Photonics
Feb 28, 2022
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Just as a terrestrial globe cannot be flattened without distorting the distances, it seemed impossible to visualize abstract mathematical objects called flat tori in ordinary three-dimensional space. However, a French team ...
Mathematics
Apr 26, 2012
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Most physicists believe that the structure of spacetime is formed in an unknown way at the Planck scale, i.e., at a scale close to one trillionth of a trillionth of a metre. However, careful considerations undermine this ...
General Physics
Nov 9, 2018
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(PhysOrg.com) -- Two teams of astronomers have used data from NASA's Chandra X-ray Observatory and other telescopes to map the distribution of dark matter in a galaxy cluster known as Abell 383, which is located about 2.3 ...
Astronomy
Mar 14, 2012
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(Phys.org) —A wearable display being developed by UA optical scientist Hong Hua could have capabilities even more advanced than those of the recently unveiled Google Glass, a pair of glasses with smartphone capabilities.
Hi Tech & Innovation
Aug 20, 2013
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People can let their fingers - and hands - do the talking with a new touch-activated system that projects onto walls and other surfaces and allows users to interact with their environment and each other.
Hi Tech & Innovation
Oct 9, 2012
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Many commercial robotic arms perform what roboticists call "pick and place" tasks: The arm picks up an object in one location and places it in another. Usually, the objects—say, automobile components along an assembly line—are ...
Robotics
Feb 25, 2013
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Fish can hide in the open ocean by manipulating how light reflects off their skin, according to researchers at The University of Texas at Austin. The discovery could someday lead to the development of new camouflage materials ...
Plants & Animals
Jun 3, 2013
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Scientists know that physical and biochemical signals can guide cells to make, for example, muscle, blood vessels or bone. But the exact recipes to produce the desired tissues have proved elusive.
Biochemistry
Sep 18, 2013
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Animals navigate and orient themselves to survive – to find food and shelter or avoid predators, for example. Research conducted by Dr. Nachum Ulanovsky and research student Michael Yartsev of the Weizmann Institute's Neurobiology ...
Plants & Animals
Apr 18, 2013
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