Cams are used in certain kinds of locks.
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Light energy can be absorbed and released within special phosphorescent paint.
Magnetic repulsion and eddy current braking create curving patterns.
Young children may get exposed to colour mixing when colouring in, but they will understand more directly if their activity has the purpose of discovering what colours they can make from other colours.
Catch me if you can! It’s a race between predator and prey but also between different predators to see who can catch the most food.
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