A wheel with teeth along its edge. A gear’s teeth fit into the teeth of another gear. As one gear turns, the other gear turns in another direction. If the gears are different sizes, they will turn at different speeds. A set of gears can be used to change speed,…

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Earth Day eBook SaleWednesday April 11, 2018

Earth Day eBook Sale

I am so pleased that HarperCollins is doing a special promotion with two of my books for Earth Day. Between now and April 23, the eBook editions of two of my books, GLOBAL WARMING and WILDFIRES, will be on sale for just 99¢…

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