In 1798, officer and physicist Benjamin Thompson (a.k.a. Count Rumford) made a simple but powerful observation while watching cannon barrels being drilled in Munich. The metal heated up continuously during the process, leading him to conclude…

In 1798, officer and physicist Benjamin Thompson (a.k.a. Count Rumford) made a simple but powerful observation while watching cannon barrels being drilled in Munich. The metal heated up continuously during the process, leading him to conclude…