Science: Dryer Up.

It all began with a tantalizing British problem: Shipments of U.S. tanks arrived in British ports all assembled and tuned up. But before they could be driven away, they had to be "de-slushed" of heavy coats of rust-preventing grease. While they lay helpless at dockside, Nazi bombers could knock them off like sitting ducks.

The British appealed to U.S. shippers: was there no way to pack the tanks so they could be driven off pronto? The next shipment of tanks came wrapped in plastic film, with a drying material inside to prevent...

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