Rational knowledge of blood in modern times

Following the advance of sciences, 'particularly biochemistry, 'blood is now better and 'more rationally understood 'than in ancient eras when some 'old' books were conceived, composed, published and promoted. In those times, 'there was no radio, television, telephone 'or Internet for ideas in books to be more widely discoursed 'or critically explored. As printing technologies and the system of production of papers were not as developed as in modern societies, illiteracy rate was also high.