We are taller in the morning than in the evening.
When we crawl out of the sack in the morning we are at our tallest. On average, we are approximately one half inch taller when we wake in the morning, thanks to excess fluid between within our spinal discs. While we are sleeping, these fluids replenish. During the day our body has to deal with the stress of standing, so the discs become compressed and the fluid seeps out. This results in us losing a small amount of extra height.
Our stomach manufactures a new lining every three days to avoid digesting itself.
As a part of the digestive process, our stomach secretes hydrochloric acid (HA). HA is a powerful corrosive compound also used to treat various metals. The HA our stomach secretes is also powerful, but mucous lining the stomach wall keeps it within the digestive system. As a result it breaks down the food we consume, but not our own stomach.
Our body produces enough heat in only thirty minutes to boil a half-gallon of water.
Our body is the epitome of a study on the laws of thermodynamics. We produce heat from all that is going on – exercise, metabolizing food, maintaining homeostasis – and as we sweat, exhale, excrete, and urinate (lovely thoughts, all of them).