SELF ASSIGNMENT & INCREMENTING http://blog.carolineartz.me/ruby-operators/
x = 1 #=>1
x += x #=>2
x -= x #=>0
x += 4 #=>x was 0 so x= + 4 # x is positive 4
x *= x #=>16
x **= x #=>18446744073709551616 # Raise to the power
x /= x #=>1