NASA Technical Memorandum 81689 is titled: “The History of Ball Bearings”
Fun Fact of the Day
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Rule 5: Wednesday
Hump Day Video
Huh.
Fun Fact of the Day
Rule 5: Tuesday
Tuesday Tease
Fun Fact of the Day
The first U.S. cents were 100 percent copper, while today’s pennies are 95 percent zinc with a copper coating measuring only 1/2000th of an inch.
Rule 5: Monday
Fun Fact of the Day
Rule 5: Sunday
Week-End
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