Imagine trying to understand the intricate, hidden machinery of a clock without ever being able to open it. You can only observe the movement of its hands and listen to its ticks. This is the profound challenge faced by geophysicists who study the Earth’s interior. Meet Hana Behounkova They cannot drill more than a few kilometers into the crust; instead, they must use indirect methods—seismic waves, gravity fields, and magnetic signals—to piece together a picture of the dynamic processes occurring thousands of kilometers beneath our feet.