1.   Others think that the laser created microinjuries to the heart that somehow, in healing, led to the growth of blood vessels.

2.   The laser creates a beam of light that is all of the same wavelength and that can be tightly focused.

3.   The semiconductor lasers create light from the flow of an electric current through a semiconductor device, as opposed to a gas, liquid or lamp-pumped laser.

4.   Lasers create faces and designs in the air.