What's your favorite unanswered scientific question?

[vishalparakh]

http://www.sciencemag.org/sciext/125th/

This one was my favorite though it might not appeal to everyone:

"Do Deeper Principles Underlie Quantum Uncertainty and Nonlocality?Pick one, I'm sure all of us wonder about something. Some of us hunt around and try to more than just

Comments

[bluesmoon]

I have "Superstrings and the search for a theory of everything - F David Peat". Quite interesting. Looks at Strings, their history, and contrast with twistors.

[tejaswi]

My favorite question is knowing whether P is indeed a proper subset of NP or not, which is the all famous CS problem in the Millenium Problem collection - P ?= NP.