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Explore the most exciting new ideas and emerging concepts in science, health, technology and the environment with 91av’s exclusive in-depth articles, interviews and long reads.

Health

Cavities could be prevented by a gel that restores tooth enamel

Enamel does not naturally regenerate, which can lead to painful cavities, but a gel that harnesses some of the properties of saliva could restore the hard, shiny layer to teeth

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Health

Walking 3000 steps a day seems to slow Alzheimer’s-related decline

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Environment

Antarctic glacier’s alarming retreat is the fastest ever seen

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Space

SpaceX’s Starlink and other satellites face growing threat from sun

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Space

We may have found a surprisingly nearby cluster of primordial stars

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Life

Orcas are ganging up on great white sharks to eat their livers

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Physics

Quantum computers reveal that the wave function is a real thing

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Humans

Denisovans may have interbred with mysterious group of ancient humans

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Chemistry

Bulletproof fabric laced with carbon nanotubes is stronger than Kevlar

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Environment

Your flight emissions are way higher than carbon calculators suggest

Existing tools that work out the carbon footprint of flights greatly underestimate their warming impact, say the makers of a new calculator

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Health

The gut microbiome may play a role in shaping our personality

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Humans

Boy’s body was mummified and turned green by a copper coffin

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Health

Magnetic gel could remove kidney stones more effectively

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Physics

The US is unlikely to test nuclear weapons, despite what Trump says

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