Stephen Hawking was one of the world's most celebrated and inspiring physicists, known for his theories on relativity, black holes, and quantum mechanics. He wrote the bestseller A Brief History of Time to explain a range of cosmology topics to the general public.
만 9~12세
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Matt Doeden began his career as a sports writer. Since then, he's spent more than a decade writing and editing children's nonfiction. Matt lives in Minnesota with his family.