https://www.lifesitenews.com/opinion/light-at-conception-gods-creation-not-ours
"Flash of light at conception: God’s miracle to admire, not ours to exploit"
God’s active act of creation, as described in Genesis 1, begins with those familiar words “Let there be light,” or, as my Latin-loving colleagues prefer, “fiat lux.”
Throughout the Scriptures, God’s presence and power is associated with light. This is most obviously true in all of the writings the Apostle John. In fact, as 1 John tells us, “God is light and in Him there is no darkness at all.”
But this is more than history and metaphor. As it turns out, it’s observable in the microscopic realm as well.
Think about this for a moment. At the moment that you, I and everyone else who has ever lived were conceived, the microscopic equivalent of “fireworks” went off. A kind of mini “Big Bang.”
https://www.catholic.org/news/hf/family/story.php?id=68661
Spark of Life: Scientists discover moment souls enter eggs at the time of conception
she saw the moment a soul entered the newly fertilized egg!
And now the truth.
https://www.nature.com/articles/srep24737
What was this spark being attributed as the soul entering a fertilized egg?
Zinc reacting with fluorescent tag solution in a lab. Scientists wanted to observe the zinc so they tagged it. The chemical reaction of the zinc with the solution created ultraviolet light for the purposes of being observed as the scientists wanted.