![]() | Children may be at greater risk from the microscopic particles in traffic pollution than previously thought, according to new research seen by BBC News. |
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Experiments showing how much snakes' bellies grip in different directions has shed light on how they slither.



![Basking shark [Pic: Dan Burton Photo]](http://newsimg.bbc.co.uk/media/images/45892000/jpg/_45892070_shark3_226.jpg)

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