Chemical changes produce new substances. For this reason, they often cannot be undone. Some chemical changes can be reversed, sort of. To do so requires another chemical change to take place. For example, you can undo the tarnish on copper pennies by placing them in vinegar. The acid in the vinegar reacts with the tarnish. This is a chemical change that makes the pennies bright and shiny again. You can try this yourself at home to see how well it works. Other chemical changes cannot be reversed at all or may be difficult to do. Rusting is a chemical change. If metal rusts, the best you can do is to sand off the rust to get down to the shiny metal. Although the metal may now be shiny, the rust was removed. The rust was not changed back into the original metal. Some chemical reactions occur in only one direction. These reactions are called irreversible reactions. For example, you cannot change a fried egg back into a raw egg. Can you think of some other irreversible reactions related to cooking? Would you like a piece of cake?

Question: "Can chemical changes be undone?"

Response: "never"
OPTIONS:
- no
- yes

A: no

In 1964 , in the peak of Beatlemania , a reluctant John Lennon is persuaded by manager Brian Epstein to meet Freddie Lennon , the father who abandoned him seventeen years earlier , with the press in attendance . When they meet , John accuses his father of abandoning him , but his father says that '' he left it up to John . '' John and Brian quickly leave the meeting . The movie then jumps to 1967 , after Brian Epstein has died . The Beatles are giving a press conference about their new film , Magical Mystery Tour . John is skeptical about the film , but Paul convinces him to go through with the idea . John then invites his father to his mansion to live with him . Freddie Lennon arrives and meets his grandson , Julian . Sitting with his wife , John reads the criticism of Magical Mystery Tour , while comparing his wife to Brigitte Bardot , whom he says he will meet after he returns from India . John finds a letter addressed to him , with the word '' Breathe '' written on it . Later , after finding his father in a neighbor's house , Freddie reveals that he has a 19 year old girlfriend named Pauline , with whom he wants to live . Lennon accuses his father of leaving him again , and then leaves , after telling his father that he wo n't live with him anymore . After meeting Maharishi Mahesh Yogi , the Beatles quickly return to London , and in a press conference they say they made a mistake when they trusted Maharishi . The journalists are curious about the Beatles new business -- Apple Records .

Question: "What is the name of the film John is skeptical about?"

Response: "Magic Tour"
OPTIONS:
- no
- yes

A: no

Zinni feared that Bin Laden would in the future locate himself in cities, where U.S. missiles could kill thousands of Afghans. He worried also lest Pakistani authorities not get adequate warning, think the missiles came from India, RESPONSES TO AL QAEDA'S INITIAL ASSAULTS 135 and do something that everyone would later regret. Discussing potential repercussions in the region of his military responsibility, Zinni said, "It was easy to take the shot from Washington and walk away from it. We had to live there." Zinni's distinct preference would have been to build up counterterrorism capabilities in neighboring countries such as Uzbekistan. But he told us that he could not drum up much interest in or money for such a purpose from Washington, partly, he thought, because these countries had dictatorial governments. After the decision-in which fear of collateral damage was an important factor- not to use cruise missiles against Kandahar in December 1998, Shelton and officers in the Pentagon developed plans for using an AC-130 gunship instead of cruise missile strikes. Designed specifically for the special forces, the version of the AC-130 known as "Spooky"can fly in fast or from high altitude, undetected by radar; guided to its zone by extraordinarily complex electronics, it is capable of rapidly firing precision-guided 25, 40, and 105 mm projectiles. Because this system could target more precisely than a salvo of cruise missiles, it had a much lower risk of causing collateral damage. After giving Clarke a briefing and being encouraged to proceed, Shelton formally directed Zinni and General Peter Schoomaker, who headed the Special Operations Command, to develop plans for an AC-130 mission against Bin Laden's headquarters and infrastructure in Afghanistan. The Joint Staff prepared a decision paper for deployment of the Special Operations aircraft. Though Berger and Clarke continued to indicate interest in this option, the AC-130s were never deployed. Clarke wrote at the time that Zinni opposed their use, and John Maher, the Joint Staff 's deputy director of operations, agreed that this was Zinni's position. Zinni himself does not recall blocking the option. He told us that he understood the Special Operations Command had never thought the intelligence good enough to justify actually moving AC-130s into position. Schoomaker says, on the contrary, that he thought the AC-130 option feasible. The most likely explanation for the two generals' differing recollections is that both of them thought serious preparation for any such operations would require a long-term redeployment of Special Operations forces to the Middle East or South Asia. The AC-130s would need bases because the aircraft's unrefueled range was only a little over 2,000 miles.

Question: "Why were AC-130s never deployed?"

Response: "Bases in the middle east would be required for re-fueling"
OPTIONS:
- no
- yes

A:
yes