… The noises, detected by specialized instruments at 70,000 feet above the Earth’s surface, are known as infrasound because they are so low-pitched they are inaudible to human ears. Picked out from among a wash of hidden low-frequency sounds — including thunder, ocean waves, rocket launches, cities, wind turbines and even planes, trains and automobiles — the strange infrasounds have so far defied explanation.
“[In the stratosphere,] there are mysterious infrasound signals that occur a few times per hour on some flights, but the source of these is completely unknown,” lead investigator Daniel Bowman, a senior scientist at Sandia National Laboratories in New Mexico, said in a statement. …
Maybe just a nifty tchotchke, to have sitting around one’s home or office?
They are kinda cool, with the way you can set them down any which way and they look the same.
Some of the guesses there make me think about how much we can over think such things. People in the past didn’t necessarily make every thing they made for some practical purpose.
I’m very much in favour of the “knitting tool specifically for gloves” theory.
Saw a mini-documentary on them where this use was demonstrated. Extremely practical for making the fingers for gloves, and lots of them in short time.
Very similar to a Strickliesel, whatever that is called in English:
