 1915 Nobel Prize in Physics

Jointly awarded to Bragg Junior and Senior. Junior was only 25 at the time, the youngest ever STEM nobel prize laureate as of 2024, and given that science is getting harder nad harder, this is not likely to change ever.

Part of what they did was to determine the structure of a bunch of rocks. These must have been every exciting times, to be able for the first time to have direct evidence of the molecular composition of materials.