In 2019, the International System of Units (SI) was redefined in terms of constants that relate to the natural world. This assures the future stability of the SI and opens the opportunity for the use of new technologies, ...
General Physics
Nov 15, 2022
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2
You probably remember your grade school science teachers explaining that energy can neither be created nor destroyed. That's a fundamental property of the universe.
Environment
Aug 4, 2021
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96
Duncan Watts, a Penn Integrates Knowledge Professor and computational social scientist with appointments in the Annenberg School for Communication, School of Engineering and Applied Science and the Wharton School, has published ...
Social Sciences
Apr 6, 2021
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Ultra-intense lasers with ultra-short pulses and ultra-high energies are powerful tools for exploring unknowns in physics, cosmology, material science, etc. With the help of chirped pulse amplification (CPA) (2018 Nobel Prize ...
Optics & Photonics
Jan 12, 2021
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11
A bird that since John James Audubon's time has scurried under the radar of all but the most attentive ornithologists, conservationists and naturalists has received protection from the U.S. Fish and Wildlife Service.
Plants & Animals
Dec 16, 2020
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3
Capital punishment has been practiced on American soil for more than 400 years. Historians have documented nearly 16,000 executions, accomplished by burning, hanging, firing squad, electrocution, lethal gas and lethal injection. ...
Political science
Feb 19, 2019
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3
Thirteen miles from the coast, marine biologist Bruno Pernet was himself surrounded by concrete, asphalt and an assortment of roughly 10,000 seashells.
Plants & Animals
Jan 28, 2019
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5
The breeding seasons of wild house finches are shifting due to climate change, a Washington State University researcher has found.
Ecology
Dec 19, 2018
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4
The kilogram doesn't weigh a kilogram any more. This sad news was announced during a seminar at CERN on Thursday, 26 October by Professor Klaus von Klitzing, who was awarded the 1985 Nobel Prize in Physics for the discovery ...
General Physics
Nov 6, 2017
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2599
Technische Universität Ilmenau and the Physikalisch-Technische Bundesanstalt (the National Metrology Institute of Germany) are developing a balance which is required for measuring the redefined kilogram that will be introduced ...
General Physics
Jun 20, 2017
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18
