https://www.theatlantic.com/magazine/archive/2019/10/whale-songs-are-getting-deeper/596635/
Sep 11, 2019 - Scientists have theories as to why—some worrisome, some hopeful, all involving humans.
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https://www.twz.com/8778/the-u-s-navy-tried-to-turn-whale-songs-into-secret-code
The Cold War project cooked up an ingenious, but overly complicated method for submarines to send covert messages.
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