scientists have captured images of the flash of light that sparks at the very moment a human sperm cell makes contact with an egg.<br /><br />“sparks” of conception—an incredible physical reaction when sperm meets an egg. The flashes are actually made of zinc, and their brightness could indicate the strength of fertilization.<br /><br />Northwestern University researchers previously saw the reaction in mice, but this is the first time in human sperm and eggs.
