An excited atom decaying in a vacuum experiences a force very similar to friction, according to calculations done by physicists in the U.K. At first sight, the result appears to violate Einstein's equivalence principle. However, the researchers calculate that, in fact, relativity...
A new metamaterial film provides cooling without needing a power input. Made out of glass microspheres, polymer and silver, the material uses passive radiative cooling to dissipate heat from the object it covers. It emits the energy as infrared...
Could dark matter consist of primordial black holes, as numerous as the stars? It’s an old, improbable idea, but it made a Lazarus-like comeback a year ago, when the discovery of gravitational waves suggested that the cosmos abounds with unexpectedly heavy black holes....
A Nobel laureate who failed his school exams before going on to pioneer body scanning technology has died aged 83.
Astronomers have discovered a giant black hole that's so hungry, it's been gorging on a star for more than a decade - more than 10 times longer than any stellar meal detected before.
While investigating how efficiently the brain can learn new information, physicists have found that, at the neuronal level, learning efficiency is ultimately limited by the laws of thermodynamics—the same principles that limit the efficiency of many other familiar...
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