Tech
New ‘ionic wind’ can dry foods while preserving nutrients
Researchers have come up with a way to increase the energy efficiency of a drying technique, possibly making it ready for prime time.
By Sid Perkins
Tech
More Stories in Tech
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ComputingHow to fight online hate before it leads to violence
Counter-speech, artificial intelligence and other tools can help spot online hate — and maybe thwart it. New studies show how.
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ChemistryA new catalyst turns greenhouse gas into jet fuel
The catalyst is an improvement over its predecessors. Made of cheap materials like iron, it produces jet fuel in a single step.
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TechBye-bye batteries? Power a phone with fabric or a beacon with sound
New piezoelectric systems produce electricity in unusual ways, such as when a certain nylon bends or underwater ceramics vibrate.
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MathScientists Say: Algebra
Algebra is a type of mathematics that studies symbols and how they can be shifted around.
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TechTracking Santa with science
Santa may be magical. But the North American Aerospace Defense Command (or NORAD) uses science to track his journey.
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TechFlexible devices may help clothes solar power your screens
A fluorescent polymer duo boosts the efficiency of solar cells. One day this material may coat your jacket, hat or backpack to provide power on the go.
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TechNew device tells smiles from frowns — even through a mask
Most facial-recognition software has to see the whole face to work. The new type can reconstruct an entire expression from just viewing your cheeks.
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TechLet’s learn about virtual reality
Scientists use virtual reality to build new games and to help people fight their fears.
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TechThis artificial skin feels ‘ghosts’ — things you wish were there
Engineers have developed a wearable device that simulates the sense of touch. It may benefit robotic surgery and deep-sea exploration.