Corentin Louis Kervran was a scientist who lived a long time ago. He was really interested in studying things like rocks and dirt and other things that make up the earth.
One of the things that Kervran was particularly interested in was how certain living things, like chickens and snails, could turn some things into other things. For example, he noticed that chickens could turn calcium in their food into strong bones, and that snails could turn calcium into their shells.
Kervran started to wonder if there was some kind of magic or special power that these living things had that allowed them to do this. But he was a scientist, which meant that he always looked for evidence and proof before making any conclusions.
So Kervran did a lot of experiments to see if he could figure out how these living things were able to turn one thing into another. He found out that there was actually a very simple and natural process that was happening.
The process was called "biological transmutation," and it basically meant that living things were using their own bodies to turn one element into another. This was a really big discovery, because before Kervran, people thought that only really strong and powerful things could change elements, like nuclear bombs or big machines. But Kervran showed that even a little chicken or snail could do it!
Kervran's work was really important because it opened up a whole new way of thinking about the world. He showed that even things that seem really small or weak can have really big effects on the world around us. This is something that we can all learn from and use to make the world a better place.