The First Light of Human Life - In the instant a sperm cell signals an egg, a silent flash erupts—a brilliant burst of zinc ions known as the zinc spark. Once invisible to the human eye, this microscopic flare marks the precise moment fertilization begins. Millions of zinc atoms surge outward from the egg, glowing as they bind to tiny molecules, a reaction triggered by a rapid rise in calcium. If you’re enjoying the content and want to support us, consider subscribing! | The Brain Maze