Who: Louis Legrange (France)
Innovation: Inline skates aka roller blades
What does it do?
So there's some wheels arranged in a line on a boot. The wheels will help you get places faster. Or think of it as ice skating during warmer weather.
What problem does it solve?
Legrange designed his skates in 1849 for an opera where a character needed to look like they were skating on ice.
Rollerblades were one of those fads, cool for a while in the 90s, then not so cool two years later. In recent years, thanks to the popularity of roller derby, the rollerblade's more stable cousin, the roller skate (two wheels at the front, two wheels at the back) has seen a resurgence.
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