Kopi Luwak "Washington Post" reviewed kopi luwak available to US consumers and concluded "It tasted just like...Folgers. Stale. Lifeless. Petrified dinosaur droppings steeped in bathtub water. I couldn't finish it." Some critics claim more generally that kopi luwak is simply bad coffee, purchased for novelty rather than taste. Massimo Marcone, who performed extensive chemical tests on the beans, was unable to conclude if anything about their properties made them superior for purposes of making coffee. He employed several professional coffee tasters (called "cuppers") in a blind taste test. While the cuppers were able to distinguish the kopi luwak as distinct from the
Metabolic waste excreta. Some mammals including humans excrete uric acid as a component of their urine but it is only a small amount. These compounds form during the catabolism of carbohydrates and lipids in condensation reactions, and in some other metabolic reactions of the amino acids. Oxygen is produced by plants and some bacteria in photosynthesis, while CO is a waste product of all animals and plants. Nitrogen gases are produced by denitrifying bacteria and as a waste product, and bacteria for decaying yield ammonia, as do most invertebrates and vertebrates. Water is the only liquid waste from animals and photosynthesizing plants.