What Galton had was what would become known as the dog whistle, an instrument that works ... corner of a room or a window with no serial killer lurking outside, you might have assumed you have ...

This unique sliding whistle would produce high-pitched sounds at frequencies above the limit of human hearing. Galton tested his invention on the streets of London by blowing it near dogs and charting ...

In politics, the term "dog whistle" denotes a coded message understood only by people who support that message. Just as a dog whistle's supersonic sound can be heard only by canines, the political ...