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Humpback whales are far better known for their bellowing "songs" that can travel up to six miles, but the animals also have quiet voices. Biologists have observed humpback calves “whispering” to their mothers in tones that can be heard only within 330 feet—a strategy to prevent predators, such as orcas, from eavesdropping. Calves also want to avoid adult male humpbacks, which may try to separate the calf from its mother to mate. This shortened time with its mom could ultimately weaken the calf, which needs to drink 50 gallons of milk a day to fuel up for its long migration.

QG6a TIL more Americans live in Mexico City than Wyoming.
D17vV TIL During WWI female munitions workers were nicknamed "Canary Girls" because exposure to TNT is toxic, and repeated exposure turns the skin an orange-yellow colour reminiscent of the plumage of a canary
ADrAo TIL of the feedback sandwich, the recommended method for managers to give negative feedback, by sandwiching the negative remark between two positive ones
X98r TIL that more than 1,000 experts, including Stephen Hawking, Elon Musk and Steve Wozniak, have signed an open letter urging a global ban on AI weapons systems
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