Taking your car to the mechanic is convenient, but it isn't always the cheapest. Diagnosing your car yourself, for example, can save you a lot of money.
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The World's Weirdest Rotary Engine Is A 118-Year-Old French Spinner That Leaks Castor Oil Everywhere
Wankel rotary engine powered thousands of aircraft. One of several problems: It spewed castor oil on its pilots.
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