Felix Andries Vening Meinesz was a really smart man who studied the earth and how it moves around in space. He looked at things like rocks and mountains to try to understand what made our planet behave the way it did.
He also made special machines (like big scales) that he put in the ocean to measure how deep it was and how the water moved. This helped him learn more about the earth and how everything was connected.
Overall, Felix Andries Vening Meinesz was a really important scientist who taught us a lot about our planet and how everything in it works together.