“Somewhere in your generation — maybe in this room — are pioneers who are going to be the first to set their foot on Mars,” President Obama said April 13 at the White House Science Fair.

It’s one of President Obama’s favorite events. Teams of young innovators showed the president novel ways to capture power from ocean currents, chill vaccines with bicycles and 3D-print everything from game pieces to new prosthetic limbs.

Want more big ideas? Check out more of this year’s participants and projects.