The source of the video is howautowork.com it describes car engine types with respect to its cylinder arrangement in-line engine, vee type engine ,vee in-line engine ,rotary engine and radial engine

The source of the video is autoprinciple.com is this video define the main structure of cylinder block and it main component and manufacturing materials and differenret designs with an example from mazda factory about clinder block casting process so autoprinciple is the vision of theory

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A Lichtenberg figure being created by a tap from a nail