The migration that remade Africa
It's not easy to extract iron from its ore. But the peoples of the ancient city of Great Zimbabwe—the capital of a thriving kingdom in southern Africa between A.D. 1000 and 1700—were masters.
16:13
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כתבות אחרונות מאתר 'Phys'
COP31 opens with leaders under pressure to tackle climate crisis
The COP31 climate talks kicked off Monday with an early fight over money as the U.N.'s chief urged world leaders to "get serious" about tackling the crisis after a year of devastating weather extremes.
16:13
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A hummingbird's brilliant magenta feathers depend on a hidden middle layer
The brilliant magenta feathers on the head and throat of a male Anna's hummingbird present an optical puzzle. Magenta cannot be produced by a single wavelength of light. Instead, the feathers reflect a mixture of red and blue. Scientists understood the strong red reflection, but the weaker blue component was harder to explain.
16:13
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CT scanning the centuries-old head of Jeremy Bentham
Cutting-edge medical imaging techniques have revealed that Jeremy Bentham, the Georgian philosopher and reformer, suffered from chronic toothache and a jaw riddled with arthritis.
14:43
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Sell-side analysts fail to adequately adjust stock forecasts after Fed meetings
When the U.S. Federal Reserve announces a change in its interest rate, consumers expect shifts in borrowing costs elsewhere and potential price adjustments for things like housing and some consumer goods. New research, however, shows that stock market analysts generally give a collective "meh" around the time of Fed meetings when it comes to forecasting how much stocks will trade for in the future, called a price target.
14:43
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Optical experiment demonstrates the strong Mpemba effect in a single qubit
Typically, after a physical system is disturbed, it can gradually return toward a state of thermal equilibrium by exchanging heat with its surroundings. Thermal equilibrium is a state in which there is no net transfer of heat between the system and its surroundings.
14:43
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Crystals hint at a volcano's ability to erupt
University of Queensland researchers have shown tiny crystals are a window to activity inside volcanoes and could provide clues to when they might erupt.
13:12
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'Burning': Life under the world's dirtiest skies
On the outskirts of India's capital, a short motorbike ride through the urban area with the world's worst air pollution leaves salesman Kanwar Singh coated in toxic dust.
11:41
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Despite sacrificing people after catastrophic El Niño flooding, ancient societies were generally peaceful
To understand how societies might react to climate change, archaeologists look at social responses to extreme climate events in the past—and in some places, that included measures as drastic as human sacrifice. Mass ritual sacrifices along the desert coast of northern Peru have been linked to catastrophic flooding caused by El Niño, which made researchers wonder if such sacrifices were part of a rise in violence driven by resource scarcity. But a new survey of the Lambayeque Valley suggests that violence was extremely rare, even during periods of ecological upheaval.
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