Right Direction Lyrics Follow

In mathematics and physics, the right-hand rule is a common mnemonic for understanding orientation conventions for vector cross product in three dimensions.
Most of the various left- and right-hand rules arise from the fact that the three axes of three-dimensional space have two possible orientations. This can be seen by holding your hands outward and together, palms up, with the fingers curled. If the curl of your fingers represents a movement from the first or x-axis to the second or y-axis, then the third or z-axis can point along either thumb. Left- and right-hand rules arise when dealing with coordinate axes, rotation, spirals, electromagnetic fields, mirror images, and enantiomers in mathematics and chemistry.

Source: Wikipedia