Humans
A radical new idea for how our ancestors invented stone tools
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Discover the latest science and technology news from around the world with 91av. Read exclusive articles and expert analysis on the newest developments in space, physics, health, technology, the environment and more.
Chemistry
Nuclear fusion fuel could be made greener with new chemical process
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Life
Two-fingered dinosaur used its enormous claws to eat leaves
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Technology
AI can forecast the weather in seconds without needing supercomputers
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Society
Scientists push back against US attacks on science at physics summit
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Health
Tattoos are being linked to some cancers. Are they really a risk?
Analysis
Space
Dark energy isn't what we thought – and that may transform the cosmos
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