US freight trains are getting longer – is that safe?

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US freight trains are getting longer – is that safe?
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Thousands of very long freight trains safely run every day in the US, but a recent chemical spill in Ohio has raised questions about whether longer trains are at a higher risk of derailing

A 600-metre-wide patch of mangrove forest can reduce the water level during a tropical storm by 2.8 metres, according to modelling of the Pearl river delta in ChinaYour cells crackle with electric signals that guide embryonic development and heal wounds.

If we can learn to tweak this “bioelectric code”, we might be able to prevent cancer and even grow new limbsPollution isn’t always easy to spot, but public data and some visual clues can give an idea of whether rivers are in a good ecological state, and help you take part in our Save Britain's Rivers campaignCertain bacteria have been linked with a loss of collagen, the protein that gives youthful skin a smooth appearance.

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