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Levers How are wheelbarrows can openers and bicycle brakes alike? Why is it easierto hold a bolt tight with a pair of pliers than with your bare hands? Why is iteas... »
De puzzelplaneet De PuzzelplaneetAuteur: David GloverSerie: Maths QuestEen wiskundig mysterie over statistiek.Ruimtestation Alfa is bezet door robots. Jij bent de enige die h... »