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#145 COP27 climate summit preview; unexpected animal sounds

The world, the universe and us

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How to Measure a Double Slit Experiment?

The swatch uses a cloud of helium atoms, all of which are in multiple quantum states at once. These quantum states interact with one another and create an interference pattern. The important thing here is that that pattern changes over time. So can they use how the pattern changes to work out how much time has passed? Exactly. It's really only helpful in a specific subset of experiments called pump probe experiments. But those experiments are really, really important in things like designing new materials.

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