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Math Quest de piratengrot De Piraten grotAuteur: David GloverSerie: Maths QuestEen wiskundig mysterie met getallen.De gruwelijke piraat Zwartbaard heeft zijn goud verborgen, en jij he... »
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... »