Rather than "poop," guano is technically all of the bird's waste material in one substance. In places where specific types of birds, such as gulls, gather in larger numbers, their dried guano is collected and used as fertilizer. This natural fertilizer is making a comeback due to organic farming, after decades of artificial fertilizer use. Most bird poop is white because of the uric acid, which isn't soluble in water, but different birds have different poop compositions. Nightingale poop contains large concentrations of nitrogen-rich urea (which is also found in urine) and guanine, an amino acid. In addition to being used in fertilizer, urea is used in cosmetic applications because it helps the skin hold in moisture, although typically synthetic urea is used today. Guanine is used in a lot of different applications because it creates a shimmery, iridescent effect in cosmetics, paints, plastics, imitation pearls and other products. It can also be extracted from other natural sources such as fish scales. POSTSUBSCRIPT should have their internal structure affected by electron-degeneracy as they contract gravitationally after their formation. Those objects should be unable to release enough energy from hydrogen nuclear burning, since their central temperatures begin to decrease after degeneracy proceeds. They should never go through the usual stellar evolution phases, living as ”failed” stars. The theoretical calculations of the two pioneer papers in 1963 marked the birth of brown dwarfs fifty years ago. Following these predictions, the motivation was there for more theoretical calculations and evolutionary models for brown dwarfs Grossman (1970); Straka (1971); Rappaport and Joss (1984), followed by many others. With the discovery of the first genuine brown dwarfs about 20 years ago, (see the chapters by R. Rebolo, G. Basri, and by B. Oppenheimer in this volume), the theory and modelling of brown dwarfs have constantly developed and improved. The first major theoretical challenge was the development of an equation of state (EOS hereafter) appropriate for the description of the dense and relatively cool interior of brown dwarfs, accounting for the effects of electron partial degeneracy and interaction between particles, namely molecules, atoms, ions and electrons (see Chabrier and Baraffe (2000) and references therein). un israel car sex act
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