Did Leonado's design actually work? What sparked Edison's invention of the light bulb, and did Bell's early telephone ring? Tough challenges lead to mind-boggling inventions. Find out how these things came to be - then model your own inventions.
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Did Leonado's design actually work? What sparked Edison's invention of the light bulb, and did Bell's early telephone ring? Tough challenges lead to mind-boggling inventions. Find out how these things came to be - then model your own inventions.
Read Less
