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Lasith Premathilaka

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MATH PUZZLE: Can you replace the question mark with a number?

Black American patent

In 1960, black American inventor, F. M. Jones was issued a U.S. patent for a "Thermostat and Temperature Control System" (No. 2,926,005).

What's the difference between a hippo and a Zippo?

What's the difference between a hippo and a Zippo?
- One is really heavy, and the other is a little lighter.
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