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A digital holographic microscope image showing a blue plane dotted with striped cones.

Radio waves trigger a porous surface (blue) to ‘sweat’ liquid droplets (multicoloured peaks). The tallest droplets (red-tipped) are 800–1,000 nanometres high. Credit: Danqing Liu

Materials science

An artificial skin oozes ‘sweat’ through tiny pores

A coating made of liquid crystals perspires a drug-laced liquid.

A synthetic coating can ‘sweat’ droplets of fluid containing ibuprofen or other compounds when stimulated by radio waves.

Coatings that can secrete fluids on demand could keep themselves clean or administer medicines to a wound. Danqing Liu at the Eindhoven University of Technology in the Netherlands and her colleagues created such a coating from liquid-crystal molecules, which can move like a liquid but, when exposed to an electric field, align themselves neatly like a crystal’s atoms.

The fluid that serves as sweat is stored in numerous micrometre-sized pores surrounded by the long liquid-crystal molecules, which stand vertically on their ends. The coating rests on a layer of glass embedded with metallic electrodes that generate radio waves similar to those produced by a Wi-Fi router.

When the radio waves are turned on, the long liquid-crystal molecules twist to orient with the waves’ direction of travel. This twisting motion wrings liquid out of the coating’s pores. The coating sweats more as the radio waves become stronger.

After the radio waves are switched off, the coating re-absorbs any sweat left on its surface in seconds.

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Astronomy and astrophysics

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Atmospheric science

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Ants shrink their brains for motherhood — but can enlarge them when egg-laying ends

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Atmospheric science

Smoke from Australian fires turned up the heat in the southern sky

The catastrophic wildfires of late 2019 and early 2020 triggered a lingering temperature rise in a section of Earth’s lower atmosphere.
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Optics and photonics

One screen, three images — some invisible in ordinary light

A graphene-based device can display several images simultaneously using a range of wavelengths.
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