Hundreds of years before the first DNA test, "Micrographia" championed the use of microscopes and set the stage for the first major discovery in biology: microorganisms. Learn how the secret of the cell was solved and how starfish led to the development of stem cell research.
Part 2: http://youtu.be/B4ayJT48pWI
Part 3: http://youtu.be/sEWb6UtC5UY
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