大约在世纪之交，如同宇航员一样，其中最典型的就是那些“公路勇士”。由于轻装上阵，他们看上去很潇洒，就像萨佛(Paulo Saffo，未来科技学家)所说，他们是过渡的一代人，他们的生活开始变得像寄居蟹。

Around the turn of the century, as some astronauts, typically executive road warriors, got smarter about packing light, says Mr Saffo, they graduated to an intermediate stage, becoming hermit crabs.

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