 On Mondays, Wednesdays, and Fridays the Nazi doctors would put her and her twin, and many other twins, naked in a room for six to eight hours and then measure every part of their bodies.Data would compare the two twins and then against previous measurements.On Tuesdays, Thursdays, and Saturdays, SS doctors would take Eva to a blood lab and tie both of her arms to restrict blood flow, then a large amount of blood would be taken from the left arm while a minimum of five injections with unknown substances would be given in the right arm.