Begg took three maternity leaves of around six months in the space of five years, returning to work each time in a four-day week capacity.
In 2022 Nasa issued three $5m contracts to companies to design a reactor.
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A piece of insulating foam on Columbia's fuel tank broke loose during launch, damaging the heat shield with devastating results.
无人居住的空屋，墙上写着“人间烟火，生活如沸”。我刚走进，就被右侧树下突然窜出狂吠的大黑狗追着跑（图：南方人物周刊记者 刘璐明）