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Why ancient deer returned to the sea and became whales

Life

Why ancient deer returned to the sea and became whales

Over the last 250 million years land animals have repeatedly begun exploiting the seas, giving rise to creatures like whales and walruses. The question is why

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People walking

Technology

Electrodes fitted behind your ear can make you walk faster

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Our ancestors mated with the mystery 'Denisovan' people – twice

Humans

Our ancestors mated with the mystery 'Denisovan' people – twice

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These searing hot chilli peppers are in danger thanks to snakes

Earth

These searing hot chilli peppers are in danger thanks to snakes

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broccoli farm

Life

Two herbivores gang up and silence a plant's cries for help

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New shades: The controversial quest to 'fix' colour blindness

Humans

New shades: The controversial quest to 'fix' colour blindness

Features

Dinobird Archaeopteryx only flew in short bursts like a pheasant

Life

Dinobird Archaeopteryx only flew in short bursts like a pheasant

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Military personnel investigating the poisoning of Sergei Skripal on 11 March in Salisbury

Health

What are Novichok nerve agents and did Russia do it?

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A male and female brown widow (Latrodectus geometricus)

Life

Daft male spiders prefer females who are more likely to eat them

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Brain zap can make people re-experience old dreams while awake

Health

Brain zap can make people re-experience old dreams while awake

While déjà-vu is a false feeling of familiarity, déjà-rêvé is a rare experience of suddenly recalling a dream – and it can be sparked by zapping the brain

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Life

Leopards that live in cities are protecting people from rabies

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Life

Mussel pain: The crisis engulfing our freshwater molluscs

Features

Earth

A deadly predator could save the UK’s threatened red squirrels

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Earth

Drones reveal huge colonies of 1.5 million penguins on islands

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