Videos: Big Contraption blog
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Web exclusives
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An extra helping of Bang - first shown on BBC Red Button.
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Beat the odds of this counter-intuitive maths problem.
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Liz peeps at the world as seen through the eyes of a fly.
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Jem generates electricity with magnets and wires.
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Dr Marek Kukula guides you through the Solar System.
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Astronomer Marek Kukula's marvels of the Solar System.
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Science speak
- Carl Sagan, astronomer, astrophysicist, cosmologist (1934-1996)
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