Hoverboards... if Back to the Future was right, we'll have them in October of next year. "For instance, Rosch and his colleagues have calculated that whereas c

Hoverboards... if Back to the Future was right, we'll have them in October of next year. "For instance, Rosch and his colleagues have calculated that whereas clouds of atoms would normally be pulled downwards by gravity, if part of the cloud is at a negative absolute temperature, some atoms will move upwards, apparently defying gravity"