It started as a gag, but Eric Zhu’s sperm races are doing good work in putting male fertility under the microscope – literally It started as a gag, but Eric Zhu’s sperm races are doing good work in putting male fertility under the microscope – literally R emember when Elon Musk challenged Vladimir Putin to physical combat and Mark Zuckerberg to a cage fight ? Neither of those brawls took place for various reasons. Not least, I suspect, because Musk is just self-aware enough to know that he