Will the next human to walk on the Moon speak English or Mandarin? In all, 12 Americans landed on the lunar surface between 1969 and 1972. Now, both the US and China are preparing to send humans back there this decade. However, the US lunar programme is delayed, in part because the spacesuits and lunar-landing vehicle are not ready. Meanwhile, China has pledged to put astronauts on the Moon by 2030 – and it has a habit of sticking to timelines. Just a few years ago, such a scenario would have seemed unlikely. But there now appears to be a…