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NASA's Mars helicopter went silent for six agonizing days

NASA's Ingenuity helicopter on Mars has exceeded everyone's expectations, recently completing its 51st flight when it was supposed to fly just a few times as a demonstration mission. But flights 50 and 51 almost didn't happen.

Understanding climate tipping points

As the planet warms, many parts of the Earth system are undergoing large-scale changes. Ice sheets are shrinking, sea levels are rising and coral reefs are dying off.

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