To a non-physicist, an "atomic beam collimator" may sound like a phaser firing mystical particles. That might not be the worst metaphor to introduce a technology that researchers have now miniaturized, making it more likely ...
Quantum Physics
21 hours ago
2
264
The timing of food intake is a major factor driving the rhythmic expression of most genes in the mouse liver, researchers report April 16th in the journal Cell Reports. The findings demonstrate that body-wide signals driven ...
Cell & Microbiology
Apr 16, 2019
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284
Researchers have measured an optical clock's ticking with record-breaking accuracy while also showing the clock can be operated with unprecedented consistency. These achievements represent a significant step toward demonstrating ...
Optics & Photonics
Apr 11, 2019
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186
Why does the observable universe contain virtually no antimatter? Particles of antimatter have the same mass but opposite electrical charge of their matter counterparts. Very small amounts of antimatter can be created in ...
General Physics
Apr 08, 2019
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8357
Fungi, algae, and cyanobacteria might not complain about jet lag. But like humans, their physiologies adhere to a roughly 24-hour cycle of behavioral patterns in the absence of external cues. Organisms that experience recurring ...
Plants & Animals
Apr 01, 2019
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11
In his Special Theory of Relativity, Einstein formulated the hypothesis according to which the speed of light is always the same, no matter what the conditions are. It may, however, be possible that—according to theoretical ...
Quantum Physics
Mar 13, 2019
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305
Scientists in the Emergent Photonics Lab (EPic Lab) at the University of Sussex have made a breakthrough to a crucial element of an atomic clock—devices which could reduce our reliance on satellite mapping in the future—using ...
Optics & Photonics
Mar 11, 2019
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2616
Optical clocks of the National Institute of Information and Communications Technology (NICT, Japan) and LNE-SYRTE (Systemes de Reference Temps-Espace, Observatoire de Paris, Universite PSL, CNRS, Sorbonne Universite, France) ...
General Physics
Mar 05, 2019
0
5
Animals have distinct behavioral patterns depending on the time of day, with diurnal animals being active during the day and sleeping at night, and vice versa in nocturnal ones. Although so-called "clock genes" are known ...
Cell & Microbiology
Feb 06, 2019
0
3
How close is human civilization to destroying the planet? The symbolic Doomsday Clock is still two minutes to midnight, as close as it has ever been, said the Bulletin of the Atomic Scientists on Thursday.
Other
Jan 24, 2019
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A clock is an instrument used to indicate, keep, and co-ordinate time. The word clock is derived ultimately (via Dutch, Northern French, and Medieval Latin) from the Celtic words clagan and clocca meaning "bell". A silent instrument missing such a mechanism has traditionally been known as a timepiece. In general usage today a "clock" refers to any device for measuring and displaying the time. Watches and other timepieces that can be carried on one's person are often distinguished from clocks.
The clock is one of the oldest human inventions, meeting the need to consistently measure intervals of time shorter than the natural units: the day; the lunar month; and the year. Devices operating on several different physical processes have been used over the millennia, culminating in the clocks of today.
This text uses material from Wikipedia, licensed under CC BY-SA
