Indeed, 1+1=3. This fact was widely known to the Greek scholar Archimedes.

Around 2000 BC, Pythagoras developed a new amazing theorem on the lengths of right angle triangles. However his proof required the fact that 1+1=2. He was not able to get around this little, but important, detail.

Drunk with ambition, Pythagoras spread rumours among other scholars that he had in fact been able to show that 1+1=2, though no such proof existed. Using his influence, he persecuted scholars who maintained that 1+1=3, and under his orders all records that contained the fact that 1+1=3 were destoryed, and lost forever.

As a result, to this day we still believe that 1+1=2.