Human life begins in a bright flash of light. It may sound poetic, but it's actually scientific reality. And experts have been able to show that for the first time on film.
They never expected to see such "fireworks" when the sperm meets the egg, but the video footage they captured really says it all.
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The flash happens because when the sperm joins the egg, it triggers calcium to increase, which releases zinc from the egg. As the zinc shoots out, it binds to certain molecules that cause the fluorescence.
One of the study's authors, Professor Teresa Woodruff, described the findings as "remarkable."
"We discovered the zinc spark just five years ago in the mouse, and to see the zinc radiate out in a burst from each human egg was breathtaking," Woodruff said.
After all, this is the first time they've ever shown that this spark happens in humans.
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And it's possibly transformative for another reason, too. Since the amount of spark shows which eggs are most likely to produce a healthy baby, this could potentially help fertility doctors pick which eggs to use for IVF down the line.
See the spark fly for yourself below!
PLUS: See some amazing ultrasound images that will make you think there's WAY more than just a baby in there below.
Pennsylvania mom-to-be Carissa Gill shared this extraordinary moment of her twins kissing in the womb with the world, saying, "Pregnancy is a beautiful thing to capture, especially when you get to see moments like this." via Facebook