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
Physics
More Stories in Physics
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Materials ScienceSuper-absorbent swab could curb errors in COVID-19 testing
A new super-absorbent swab could cut down on false negatives from COVID-19 testing. And that could help slow spread of the disease.
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PhysicsScientists Say: Piezoelectric
Piezoelectric materials produce an electric voltage when they are bent or squished. This can let us harvest electricity from movement.
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PhysicsPhysicists have clocked the shortest time span ever
The experiment revealed how long it takes light to cross a hydrogen molecule: just a couple hundred zeptoseconds.
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PhysicsWhat did you say? Fabric masks can really muffle voices
Some types of face masks muffle speech more than others — something that teachers should take into account.
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AgricultureDew collector brings water to thirsty plants
This invention grabs water from the air at night. All it needs is the sun’s warmth the next day to release that moisture to growing plants.
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PhysicsLet’s learn about gravity
Gravity is an attraction between objects with mass. The more massive the object, the more gravity it’s got.
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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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ChemistryA soil-based ‘concrete’ could make buildings green, even on Mars
A new soil-based material offers an alternative to concrete for 3-D printing environmentally friendly buildings.
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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.