When Ralph's and Luna's science fair project doesn't work, they travel back in a time machine to see how inventors from the past have dealt with failure.After meeting Thomas Edison, Henry Ford, John Lambert, Marie Van Brittan Brown, they're inspired to try again.This fantasy fiction book will appeal to science fans and budding scientists while teaching them about persistence, success, and failure.This 32-page illustrated chapter book will appeal to both reluctant and avid readers who enjoy humorous stories about time travel.