Massimo (@Rainmaker1973) “This is why train wheels are not perfectly cylindrical, but slightly conical.” — TopicDigg
Massimo
@Rainmaker1973
Engineer. Selecting and curating pictures and videos trying to awaken your sense of wonder since 2014. Science, tech, art, weather, space, the unusual around us
加入 August 2010
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This is why train wheels are not perfectly cylindrical, but slightly conical.
