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Rollers vs. Wheels

By convention definition, a roller has a cylindrical cross section shape, a significant length and can be rotated about its central axis. Rollers can be used to move, flatten or spread things. Although using tree logs beneath large blocks of stone (to move the stone...

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Keeping It Cold In California

Until relatively recently, it was not easy to keep things cold in the lower lying parts of California. A chilled beer, ice cubes in a drink and long term storage of perishable foodstuffs were all luxuries. Refrigeration as we know it today simply did not exist. Before...

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