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"It provides the propulsion that Orion needs to get us to the Moon."
The ultimate goal, she says, is robots that are far more "graceful" than those of today. "Robots […] have this clunkiness and heaviness," she says, "which is so different from the way we move."
That is not only a sadness and a loss, but becoming an aged society is a cultural and economic threat. Older people, by and large, are not the innovators or new thinkers. An ageing society risks declining in optimism, creativity and, above all, risk-taking: a top-heavy preponderance of older people makes for a conservative and fearful electorate. We are there already – and it’s getting worse.