As food is pushed along, it undergoes digestion. Digestion is the process of breaking down food into nutrients. There are two types of digestion: mechanical digestion and chemical digestion. Mechanical digestion occurs when large chunks are turned into smaller chucks. Perhaps not surprisingly, this happens when you chew your food. Once you swallow the food, your stomach also does some of this work. Chemical digestion occurs when food is broken down into useful nutrients. This is a chemical process that begins as you start to chew your food. The saliva in your mouth starts this process. Once you swallow, the acid in your stomach further breaks down food. From the stomach, the foods moves into the small intestine. In the small intestines, another set of chemicals goes to work. Are you surprised? Your small intestine, and not your stomach, does most of the work!

Question: "What is mechanical digestion?"

Response: "Occurs when large chunks are turned into smaller chucks, done by chewing"
OPTIONS:
- no
- yes

A: yes

And William Martinez, 28, who cut his medical school studies short because he couldn't afford the $39,000 in loans after two years of graduate school and four years of college. Martinez works two jobs as a physician's assistant and supports his elderly parents and 8-year-old son. Uncommon Good has a 22-member board of doctors, lawyers and representatives of Christian groups and is recruiting mentors. One goal is to get the state Legislature to pass a law to provide loan forgiveness to medical professionals and lawyers who work with the poor. Mintie said she hopes her organization can be a national model for other professions. She is trying to bring legal aid services to the Inland Valley -- the closest legal aid office is in El Monte and represents 700,000 poor people throughout the San Fernando, San Gabriel and Inland valleys. "Unless the legal aid is in the community, you can't say you are serving the poor," Mintie said. Neal Dudovitz is the executive director of Neighborhood Legal Services of Los Angeles County, the legal aid office in El Monte. He sees attorneys new to poverty law leave all the time because they can't afford the salary with their law school debt. "She's really opened a lot of eyes in terms of having people understand how the educational debt is limiting and reducing the services that are available to low-income communities," Dudovitz said. "Nancy is light years ahead of the curve on this stuff. Very little is being done practically to solve it." Mintie, her colleagues say, could have made a lot of money in private practice. "She's very kind and pleasant," said Julius Thompson, 45, an attorney at Inner City Law Center and an Uncommon Good recipient. "But she's also a woman on a mission. When she sets her sights on something, she's a formidable force."

Question: "How old was William Martinez when he had his son?"

Response: "Twenty"
OPTIONS:
- no
- yes

A: yes

Although Bin Laden, Atef, and KSM initially contemplated using established al Qaeda members to execute the planes operation, the late 1999 arrival in Kandahar of four aspiring jihadists from Germany suddenly presented a more attractive alternative. The Hamburg group shared the anti-U.S. fervor of the other candidates for the operation, but added the enormous advantages of fluency in English and familiarity with life in the West, based on years that each member of the group had spent living in Germany. Not surprisingly, Mohamed Atta, Ramzi Binalshibh, Marwan al Shehhi, and Ziad Jarrah would all become key players in the 9/11 conspiracy. Mohamed Atta was born on September 1, 1968, in Kafr el Sheikh, Egypt, to a middle-class family headed by his father, an attorney. After graduating from Cairo University with a degree in architectural engineering in 1990, Atta worked as an urban planner in Cairo for a couple of years. In the fall of 1991, he asked a German family he had met in Cairo to help him continue his education in Germany. They suggested he come to Hamburg and invited him to live with them there, at least initially. After completing a course in German, Atta traveled to Germany for the first time in July 1992. He resided briefly in Stuttgart and then, in the fall of 1992, moved to Hamburg to live with his host family. After enrolling at the University of Hamburg, he promptly transferred into the city engineering and planning course at the Technical University of Hamburg-Harburg, where he would remain registered as a student until the fall of 1999. He appears to have applied himself fairly seriously to his studies (at least in comparison to his jihadist friends) and actually received his degree shortly before traveling to Afghanistan. In school, Atta came across as very intelligent and reasonably pleasant, with an excellent command of the German language. When Atta arrived in Germany, he appeared religious, but not fanatically so. This would change, especially as his tendency to assert leadership became increasingly pronounced. According to Binalshibh, as early as 1995 Atta sought to organize a Muslim student association in Hamburg. In the fall of 1997, he joined a working group at the Quds mosque in Hamburg, a group designed to bridge the gap between Muslims and Christians. Atta proved a poor bridge, however, because of his abrasive and increasingly dogmatic personality. But among those who shared his beliefs, Atta stood out as a decisionmaker.

Question: "Where did Mohamed Atta reside while in Germany?"

Response: "He stayed with his father"
OPTIONS:
- no
- yes

A:
no