Some people become obsessed with tracking their weight, carefully counting every calorie they eat and burn through exercise. They even weigh themselves before and after every meal. In 17th century Italy, there was a man similarly fixated on measurement, though not out of vanity or a desire for the perfect physique. His motivation was purely scientific.
The human body loses significant amounts of heat and moisture through the pores in the skin. Water is also lost through breathing, as moisture-laden air is exhaled. This type of water loss is known as "insensible perspiration," which differs from regular sweating. While sweat contains solutes, insensible perspiration is the evaporation of pure water. It’s also invisible and undetectable, hence the term "insensible."
Photo credit: Amit Chowdhury
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