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The secret of concrete
Jem has a crack at concrete and explains why it is the addition of 'rubbish' (sand and stones) that makes it so remarkably strong.
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Bang Goes the Theory: Putting Science to the Test with 大象传媒 One
A content bundle of clips from the latest series of Bang Goes the Theory
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Pykrete Boat Sets Sail
Duration: 03:04
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The Standby Task Force—Series 8, Disaster Relief
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Leaves on the track—Series 8, Trains
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