Forgive me if the question sounds ignorant and petulant, but I am very curious about this and woefully undereducated in physics. I was browsing a debate board and the topic was whether or not logic is a human construct. One of the arguments posited by someone was that everyone would logically deduce that 2+2=4, but that if you started adding up velocities under relativity you would get 1+1=1. I would just like to know if this is true or not. It came from post #10 on this page: http://www.4forums.com/political/worldviews/7480-how-do-atheists-account-laws-logic.html [Broken] Appreciate anyone's time, and thanks for reading.