The Alexander Mosaic (Pompeii, c. 2nd century BC)

The mosaic depicts a scene from the Battle of Issus with the Persian king, Darius III, as the other central figure

Waves moving along a spring

Waves can move along a spring longitudinally or transversely.

Transformer connected to a circuit

The transformer, connected to a circuit, can be used as a power supply with alternating current.

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