Earth
Old Scientist: Earth’s deep memory written in the rocks
From the June archives of 91av: before we knew the truth about plate tectonics, a big stone book and how rocks remember
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Space
What a Red Planet aurora might look like
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Today on 91av
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Technology
Free-running cheetah robot clears hurdles in a single bound
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Today on 91av
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Today on 91av
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Space
Mars lander gets set for mission to probe planet’s depths
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Today on 91av
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Having a ball
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