D. Curtis DeForest, Jr., was not pleased with the engineering of everyday bicycles - the center of gravity was higher than the axles of the wheels and losing balance meant falling on the ground. Sitting down is an inefficient way to pedal - and it encouraged bad posture.
So he invented the HyperBike.
It is designed like "a roll cage within a roll cage" and can go 50 mph or more.
Even NASA has become interested in the contraption, as astronauts could use their own power to travel farther on the moon and Mars with a collapsible version of the bike. (Old lunar rovers have a limited power supply and can only travel a few miles.)