Presenter: Tom Whipple
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Some experts say this signals the start of a new space race – not just for prestige, but to build a long-term presence on the Moon, tap its resources and use it as a stepping stone to Mars. We speak to the BBC’s Science Editor, Rebecca Morelle.
描述：设计 StockSpanner 类。每次调用 next(price) 时，返回当日价格的「跨度」：从今天往回数，价格 ≤ 今日价格的最大连续天数（含今天）。
Dr Duncan Precious is a clinical psychologist who served in that role in both the British and Australian armed forces, from 2013 to 2020. He's now the clinical director and resilience consultant for defence consultancy, CDS Defence & Security.