Math

Math is a language that knows no bounds. Who can disagree that if you have one stone and then go get another you will have two stones? If we found intellegent alien life tomorrow we would already share a common language--math.

Rice in Magnitudes
Escaping Road Rage

Pure Mathematics
A Method for [Mentally] Calculating Squares

Tutorials
Complex Numbers

PS. #cards = (3x^2 + x) / 2 ; where x is the level