1 In seventeenth century English physician William Harvey discovered the circulation of the blood.

2 William Harvey worked night and day for eight years to prove how blood circulated in the human body.

3 It was left for William Harvey, who had studied under Italian physicians at Padua, to complete the discovery.

4 It wasn't until 1615 -- and the study of the heart by England's royal-court physician William Harvey -- that a connection was made between the heart and the circulation of blood.

5 Galileo, I have already indicated that Hobbes had met, William Harvey, Rene Descartes; a handful of others who were part of what we think of as the modern scientific revolutionaries.