Parasites, pic: 1954, The common dog flea magnified many times through a new x-ray microscope developed at the General Electric Laboratory in Milwaukee, U,S,A (Photo by Paul Popper/Popperfoto via Getty Images/Getty Images)
Parasites, pic: 1954, The common dog flea magnified many times through a new x-ray microscope developed at the General Electric Laboratory in Milwaukee, U,S,A (Photo by Paul Popper/Popperfoto via Getty Images/Getty Images)