downloads.bbc.co.ukdownloads.bbc.co.uk/.../pdf/magnus-effect-car.pdf · BBC Magnus effect car STIFF...
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downloads.bbc.co.ukdownloads.bbc.co.uk/.../pdf/magnus-effect-car.pdf · BBC Magnus effect car STIFF CARDBOARD TUBE The centre of a roll of foil is perfect. LIGHT CARDBOARD TUBE The