(That dog whistle later became a euphemism for thinly ... The device had a sliding plug that could adjust how much air was being blown inside the tube, including high-frequency notes.

It is increasingly appropriated as a racist dog whistle used to question and undermine the positions, qualifications and abilities of racialized people. A dog whistle is a term that also does ...

This explains why a dog can hear the ultrasound produced by a dog whistle, but humans cannot ... or faults and defects inside manufactured parts. These uses rely on what happens when ultrasound ...