Nasa is adding an extra mission to its Artemis programme before it attempts to land astronauts on the Moon for the first time in half a century.
"You could see this was something game-changing for Emperor penguins. Suddenly you're thinking, well, have we got time to save them?" he says.
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2. 分区：小于pivot的放左边，大于的放右边
Girl died from sepsis after GP sent her home twice