Health
No sweat: How can marathon runners avoid hitting ‘the wall’?
Features
Aylin Woodward
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Earth
Sumatran tigers fall 17 per cent and have just two strongholds
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Life
Hummingbirds have massive hearts to power their hovering flight
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Life
Baby pterosaurs were cute, defenceless and unable to fly
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Humans
A bacterium has been engineered to make 'unnatural' proteins
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Earth
Keystone XL oil pipeline will go ahead despite last week's spill
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Earth
Weak links in US power grid vulnerable in event of catastrophe
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Earth
The exquisite marble that sculptor Michelangelo couldn't use
Regulars
Earth
Climate change blamed for Arabian Sea’s unexpected hurricanes
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Physics
A 'magic number' of people walking across a bridge makes it sway
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Life
There is a third species of orangutan and somehow nobody noticed
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Life
How a tiny shrimp fires a savage shock wave using just its claw
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