Lunatheum on Instagram: "No wonder why engines are measured in horsepower, because the term was born from real strength and real work. When early engines were introduced, people struggled to understand their power. James Watt solved this by comparing engines to horses, the most familiar source of mechanical energy at the time. A single horse could lift, pull, and rotate heavy loads for hours, making it the perfect benchmark. Horsepower turned invisible force into something people could imagine.