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Some people believe aliens visited Earth during the age of the dinosaurs. Did aliens have anything to do with their extinction? Have aliens left other signs on Earth throughout history? Learn more to find out!
Meg Gaertner is a nonfiction children's book editor living in Minneapolis, Minnesota. She has written more than 60 educational books for children. She also writes fiction novels for young adults. When she isn't writing or editing, Meg enjoys dancing, spending time outside, and reading.
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