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Mar 3, 2021 at 15:34 comment added Gandalfmeansme I'm not sure I understand the last sentence. When bats listen to the echoes of sounds they made, they aren't trying to find themselves: they're trying to find things around themselves. The fact that they made the sound originally doesn't change that. Similarly, just because you are carrying a torch doesn't mean the only thing you are trying to see is yourself.
Mar 3, 2021 at 3:20 history answered Dale M CC BY-SA 4.0