When you can't divide a number by 0 Learn mathematics and you'll be a Hero Infinity, proportions & coordinate geometry you can get a headache, I cannot guarantee!!! maths full of + and - Beware! you can suffer from memory loss Even though the probability is very rare think your way, a headache-nobody can bear when the headache comes to maths unlike physics, chemistry or anatomy I advise you to relax And think about the solution slowly....