sweat
"Sweat is like WD-40 for your mind--it lubricates the rusty hinges of your brain and makes your thinking more fluid. Exercise allows your conscious mind to access fresh ideas that are buried in the subconscious."
"The feel of your muscles is a balm to my body, and the smell of your sweat is like flowers to my nose."
"In some ways the eccrine sweat duct is like a renal tubule. The pH of sweat is between 4.0 and 6.8; it contains sodium, potassium chloride, lactate, urea and ..."
"The sweat-gland is like a spring in which water is always bubbling up from streams down under-ground"
"Each sweat gland is like a tiny, coiled tube. These glands are in the inner layer of the skin, or dermis, and they produce sweat"

METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.