When a sperm meets an egg, there is a remarkable phenomenon known as the “zinc spark.” At the very moment of fertilization, billions of zinc atoms are released, creating a tiny flash of light. This spark occurs when the sperm enters the egg, triggering the release of zinc from the egg.

Scientists have observed this phenomenon in humans for the first time, capturing the astonishing “fireworks” on film. The zinc spark provides insights into the egg’s viability and potential to develop into a healthy embryo. Isn’t science fascinating?