this animation tv series be simply the best way for child to learn how the human body work . yes and this be biology but they will never tell it be . i truly think this be the best part of this stream of educational cartoon . i do remember you can find little book and a plastic body in several part represent skin and skeleton and and of course represent organ . in the same stream and you will find represent il était une fois lhomme which relate the human history from the big bang to the 20th century . there be represent il était une fois lespace as well ( about the space and it exploration ) but that one be more a fiction than a description of the reality since it take place in the future .