Elephants, Oskar Sala, and Subharmonics
I just recently learned that elephants have a rather keen way of communicating over long distances: Really Low Vibrations.
Elephant wiki - Scroll about halfway to “communication”. Also interesting is the fact that they know we cannot hear these frequencies, thus they up their pitch when communicating with us.
Which leads to…
Oskar Sala (1910-2002) (wiki, tribute), […]