In chapters 3 and 4 we described how the U.S. government adjusted its existing agencies and capacities to address the emerging threat from Usama Bin Laden and his associates. After the August 1998 bombings of the American embassies in Kenya and Tanzania, President Bill Clinton and his chief aides explored ways of getting Bin Laden expelled from Afghanistan or possibly capturing or even killing him. Although disruption efforts around the world had achieved some successes, the core of Bin Laden's organization remained intact. President Clinton was deeply concerned about Bin Laden. He and his national security advisor, Samuel "Sandy" Berger, ensured they had a special daily pipeline of reports feeding them the latest updates on Bin Laden's reported location. In public, President Clinton spoke repeatedly about the threat of terrorism, referring to terrorist training camps but saying little about Bin Laden and nothing about al Qaeda. He explained to us that this was deliberate-intended to avoid enhancing Bin Laden's stature by giving him unnecessary publicity. His speeches focused especially on the danger of nonstate actors and of chemical and biological weapons. As the millennium approached, the most publicized worries were not about terrorism but about computer breakdowns-the Y2K scare. Some government officials were concerned that terrorists would take advantage of such breakdowns. On November 30, 1999, Jordanian intelligence intercepted a telephone call between Abu Zubaydah, a longtime ally of Bin Laden, and Khadr Abu Hoshar, a Palestinian extremist. Abu Zubaydah said, "The time for training is over." Suspecting that this was a signal for Abu Hoshar to commence a terrorist operation, Jordanian police arrested Abu Hoshar and 15 others and informed Washington. One of the 16, Raed Hijazi, had been born in California to Palestinian parents; after spending his childhood in the Middle East, he had returned to northern California, taken refuge in extremist Islamist beliefs, and then made his way to Abu Zubaydah's Khaldan camp in Afghanistan, where he learned the fundamentals of guerrilla warfare. He and his younger brother had been recruited by Abu Hoshar into a loosely knit plot to attack Jewish and American targets in Jordan. After late 1996, when Abu Hoshar was arrested and jailed, Hijazi moved back to the United States, worked as a cabdriver in Boston, and sent money back to his fellow plotters. After Abu Hoshar's release, Hijazi shuttled between Boston and Jordan gathering money and supplies. With Abu Hoshar, he recruited inTurkey and Syria as well as Jordan; with Abu Zubaydah's assistance, Abu Hoshar sent these recruits to Afghanistan for training.

Question: "Who, along with his younger brother, had been recruited in Abu Hoshar?"

Response: "Hijazi"

A: yes

Billy and Sally are brother and sister. Billy is seven and Sally is eight. Their mother, Deborah, likes to have Billy and Sally dress up in costumes and play a game where they are answering the telephone. Usually when they play the game, Billy answers the telephone in a loud voice, and Sally answers the telephone in a quiet voice. On Tuesdays, Billy answers in a quiet voice, and Sally answers in a loud voice. On Fridays, Billy answers in a loud voice and Sally in a quiet voice. Billy has blonde hair. Sally has brown hair. Deborah has blonde hair, and Billy and Sally's father, Bob, has brown hair. He tells them to eat lettuce every time that he sees them, so that they grow big and strong like he is. Deborah likes to add some sugar with the lettuce so that Billy and Sally know what it is like to have sweet tastes in their life. One day, a Wednesday, Billy throws some lettuce into Sally's hair. Deborah laughs an grabs some straw from their farm and puts it in Billy's hair. Billy and Sally live on a farm. They have a goat, named Joey, and a duck, named Quack. They sometimes play a game with the goat where they chase him around the farm. Other times, they play a game with Quack where they wave at Quack and laugh. They have a fun life growing up on the farm.

Question: "What game do the children like to play with the duck?"

Response: "Chase him around the farm"

A: no

What if two children push a swing at the same time? Would the swing go higher? Yes, together their force would be more. It is common for forces to be combined. Most objects on Earth have at least two forces acting on them. Do you know what one of them is? Of course, that force is gravity. How many forces do you have on you right now? Gravity pulls you down toward the center of Earth. Your legs exert a downward force. They hold you up against the pull of gravity. Consider the example in Figure 1.3. A book is resting on a table. Gravity pulls the book downward. It has a force of 20 newtons. At the same time, the table pushes the book upward. Its force is also 20 newtons. The table opposes the pull of gravity.

Question: "Give two examples of combined forces action on an object"

Response: "Two children pushing a swing, book resting on a table"

A:
yes