Two doctors, Billy Cohn and Bud Frazier, from the Texas Heart Institute successfully replaced a dying man’s heart with a device—proving that it is possible for your body to be kept alive without a heart, or a pulse.
sqrt(cos(x))*cos(500x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5