One day in 1882, Thomas Edison flipped a switch that lit up lower Manhattan with incandescent light and changed the way people live ever after. The electric light bulb was only one of thousands of Edison's inventions, which include the phonograph and the kinetoscope, an early precursor to the movie camera. As a boy, observing a robin catch a worm and then take flight, he fed a playmate a mixture of worms and water to see if she could fly Here's an accessible, appealing biography with 100 black-and-white illustrations.

Louis Braille certainly wasn't your average teenager. Blind from the age of four, he was only fifteen when in 1824 he invented a reading system that converted printed words into columns of raised dots. Through touch, Braille opened the world of books to the sightless, and almost two hundred years later, no one has ever improved upon his simple, brilliant idea.