Where would we be today if it weren't for the scientists of the past? From the miniature world of genetics to the vast expanse of space, review the greatest discoveries of all time across eight different scientific categories in this multi-part series. Join host Bill Nye as he recounts the 100 most important discoveries and explains how each one has had a hand in shaping the modern world. Watch his lively and dramatic accounts and learn how the great discoveries were made, how they impacted the development of scientific knowledge and how they touch our lives today.