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@4f8ec
David Black
I am a retired chemistry, physics, math, biology, astronomy, and computer science teacher. I taught over 12 years in the public school system and at community c
http://tech.ojuve.com/services
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Electronics
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Earth
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Travel
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Mental Health
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Smartwarches
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Puzzles
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Science
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Astronomy
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Space
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Climbing
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Pets
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Humor
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Technology
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Psychology
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Education
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Research
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Brain
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Breakfast
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