Chewing chewing, the food (now called a bolus) is swallowed. It enters the esophagus and via peristalsis continues on to the stomach, where the next step of digestion occurs. Premastication is sometimes performed by human parents for infants who are unable to do so for themselves. The food is masticated in the mouth of the parent into a bolus and then transferred to the infant for consumption. (Some other animals also premasticate.) Cattle and some other animals, called ruminants, chew food more than once to extract more nutrients. After the first round of chewing, this food is called cud. Chewing is
Da Vinci Science Center two dozen hands-on activities that allow visitors to interact with various scientific fields, ranging from seismology to nano technology to animation. All of the exhibits aim to help children view science as playful and interesting. Inspired by a children's book series, this exhibit explores all the qualities of animals that people tend to find disgusting. Visitors who walk through this exhibit learn about the various means of childbirth throughout the animal kingdom and the variety of nutrient sources different species rely on, from cows chewing cud to mosquitoes sucking blood. There's also a section devoted to showing what happens to