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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.

Mathematics

Complex knots can actually be easier to untie than simple ones

Mathematicians have solved a decades-old problem in knot theory, discovering that linking two knots together can actually produce a knot that is easier to untie – the opposite of what was expected

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Space

Water might be even more important for alien life than we thought

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Environment

Climate scientists urge others to take up CO2 tracking as US cuts loom

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Environment

Built-in fire extinguishers can prevent battery explosions

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Environment

Nor’easters slamming New England are growing more powerful

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Health

You don’t need to take drugs like Ozempic consistently to lose weight

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Technology

Are batteries based on contact lenses the future of energy storage?

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Environment

Could old mines host all the solar energy we need?

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Environment

Most warming this century may be due to air pollution cuts

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Space

LIGO has spotted the most massive black hole collision ever detected

A puzzling gravitational wave was detected, and astronomers have determined that it comes from a record-breaking black hole merger

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Technology

How government use of AI could hurt democracy

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Space

We may have finally solved an ultra-high-energy cosmic ray puzzle

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Comment

Which sci-fi movies predicted the future accurately?

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Environment

Artificial cooling ‘urgent’ for Great Barrier Reef after warming spike

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