'In the 2nd century Galen used pigs to show veins carried blood, not this as many believed'
air
HERE PIG: In the 2nd century Galen used pigs to show veins carried blood, not this as many believed
In the 2nd century Galen used pigs to show veins carried blood, not this as many believed
In the 2nd century Galen used pigs to show veins carried blood, not this as many believed
HERE PIG
air
HERE PIG