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Today's theme is Creatures of the Night: When the lights go down, a different cast comes out..
The five languages today: 🇪🇸 Spanish, 🇫🇷 French, 🇳🇱 Dutch, 🇸🇪 Swedish, 🇹🇷 Turkish.
Topics span nature, science.
1944: In 1944, American zoologist Donald Griffin coined the term "echolocation" for the system bats use to navigate and hunt in total darkness, reading the echoes of their own ultrasonic pulses.