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Pulleys and Gears The most complicated machines often rely on a few simple principles oftechnology such as wheels springs screws ramps and wedges. This seriesexplores these te... »
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... »