Although my handle, Twinbrains, makes it appear that I could be a mathematical genius, I can assure you that I am not. However, somewhere during my years of education, I learned how to calculate that 2+2=4. During that education, my learned teachers did not teach me all the specific and infinite number of answers that 2+2 does not equal to, such as; 2+2=5, 2+2=73, 2+2=cow. Instead of teaching me what not to think, my teachers taught me how to think and how to calculate the correct arithmetic answer, which I believe is 4.