Rennet, the stomach contents of an unweaned animal; also, the membrane lining the stomach. The word rennet also refers to preparations that contain the enzyme rennin and that are used in curdling milk. The chief source of rennet is the fourth stomach of young calves. Rennet is used in making cheese, junket, and medicinal preparations. It is also used to coagulate casein (a milk protein) in making plastics.
Domesticated animals provide us with innumerable products, hours of labor and even loving companionship. Find out why the dog was so easily domesticated and why you'll never see someone riding a zebra.
One animal procrastinates. Another is famous for making out. Yet another might remember faces better than you do. Our nonhuman cohorts are capable of much more than instinct and action. Here are 10 captivating examples.