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Giant black-hole pair from the early Universe gives clues to how galaxies form

Nature Podcast

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The Sound of a Dry Plant

The sound is actually the sound of a stressed or very dry plant. We don't know exactly how it works, but they have a theory. It's around 20 to 100 kilohertz, which is just beyond the edge of human hearing. Some animals may actually be able to hear the sound.

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