I’m not sure if this has been blogged to death and I just haven’t noticed, but there is a superb article on the Discover site detailing The 11 Greatest Unanswered Questions of Physics.

  1. What is dark matter?
  2. What is dark energy?
  3. How were the heavy elements from iron to uranium made?
  4. Do neutrinos have mass?
  5. Where do ultrahigh-energy particles come from?
  6. Is a new theory of light and matter needed to explain what happens at very high energies and temperatures?
  7. Are there new states of matter at ultrahigh temperatures and densities?
  8. Are protons unstable?
  9. What is gravity?
  10. Are there additional dimensions?
  11. How did the universe begin?

And it’s wonderfully cute to read at the bottom of the article that these are all © 2002 The Walt Disney Company.

link via TwistyPants