[Patel] cut the PVC pipe and sealed off one end, drilling a blowing hole at 1.5 x the pipe diameter. After playing the flute, the end of the pipe was filled until the frequency exactly matched the ...

Playing the flute isn't easy even for some humans, but in the 18th century, inventor Jacques de Vaucanson figured out how to make a machine play it. Petar Milošević/Wikimedia Commons ...