First you're taught that light is wave. Then you get a little older and your teacher explains that it's actually particles called photons. Wait, which is it then?
A comprehensive study of the Arrow of Time, and why we cannot remember the future.
A small change to the theory of gravity implies that our universe inherited its arrow of time from the black hole in which it was born.
by Elizabeth Finkel
HowStuffWorks.com blogger Josh Clark writes about a paper that solves the grandfather paradox of time travel.
Fundamentals of quantum mechanics