clipped from: www.pbs.org   watch chapter 2 in Although Newton discovered the law of gravity nearly 300 years ago, until Einstein came along, scientists had no idea how gravity actually worked. running time 6:04 |
  watch chapter 4 in As Einstein struggled to unite the weak force of gravity with the much stronger force of electromagnetism, physics moved on, examining the bizarre way tiny bits of matter interact with one another inside the atom. running time 4:30 |
  watch chapter 8 in String theorists have a problem: strings, if they exist, are so small that there's little hope of ever seeing one, so how can the theory be tested? running time 3:35 |
  watch chapter 1 in In order to solve some of the deepest mysteries of the universe, the rules that govern large objects like galaxies must be combined with the rules that govern small objects like subatomic particles. running time 8:26 |