In 2019, Brooklyn residents complained for weeks about the incessant high hum, from which closed windows do not save and which adversely affects local residents.
It took NASA more than a decade to take color images of shock waves from supersonic aircraft.
The unique sound of Stradivarius violins is most likely just a historical legend. Many musicians sincerely defend their unique voice, although blind tests over and over again show that it is not possible to distinguish it by ear. Nevertheless, there are a number of theories that explain this sound, for example, by the special density of wood. After all, the master created his instruments between 1666 and 1737, at the peak of the Little Ice Age, when the trees increased their mass more slowly, with smaller and denser fibers - this can be seen even when studying Stradivarius violins with a tomograph.