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In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
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Article: As a little boy I read a book with a picture showing a man reading while floating in the Dead Sea. What a miracle! How would it feel to lie back in water so thick with salt that it was impossible to sink? Fed by the Jordan River and smaller streams, the Dead Sea is the lowest point on the earth's surface, and its water is ten times saltier than the Mediterranean. As evaporation is its only outlet, salt and other minerals become super-concentrated. Earlier this year, I drove down the long, steep hill to realize my dream. The shoreline was a broad area of bare salt-mud, but the water edge was out of sight. It seemed as if somebody had pulled the Dead Sea's plug . Eli Dior, an Israeli official, explained the problem "The Dead Sea is drying up. Every year, the surface falls about one meter, and as the water level falls, shallow areas are left high and dry." Over the last half-century, the five neighboring countries have used up almost all the water flowing into the Dead Sea to meet human and agriculture needs. Result the Dead Sea is being emptied. With population in the neighbouring countries to double at least in the next 50 years, there is little hope of restoring the water being used in this area. No country has a drop to spare for the Dead Sea, where they know it will just evaporate. To dream of opening the dams and restoring natural balance is unrealistic. Yet one ambitious high-tech dream may turn out to be not only the solution to the Dead Sea but also a ticket to peace around its shores. The "Red-Dead" is a proposed $5 billion project to bring sea water some 240 kilometers by pipeline and canal from the Red Sea to the Dead Sea. The Red-Dead may be the only solution, but even if the project is carried out successfully, the Dead Sea will be 10 to 20 meters lower than now and two thirds of its current size. Whatever the future holds, the Dead Sea's magical mix of sun, mud, sea and salt will surely survive. Many might complain that the Dead Sea is half empty--but for me the Dead sea will always be half full.
Answer: Why the Dead Sea is so salty.
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What's the passage mainly about ?

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Article: Humans may be a bad influence on their best friends---at least when it comes to problem-solving. In a task that wasn't very tough, wolves performed must better than dogs. All the animals had to do was pull the lid off a food container, containing a sausage treat. Monique Udell studies animal behavior at Oregon State University in Corvallis. She tested 10 pet dogs and another 10 dogs from an animal shelter. In one set of tests, a person was nearby but did not encourage or discourage the dogs. Those dogs typically spent 10 to 15 percent of their time gazing at the person. They spent a mere 5 percent of their time or less touching the container. Udell offered the same challenge to wolves. These animals had been raised and fed by people but still lived outdoors. Here, the wolves didn't look at the nearby person. Instead, they devoted about 90 percent of the time to struggling with the box holding a treat. When someone walked around the dogs and actively encouraged them to keep trying to open the box, the dogs did spend more time handling the problem. A few more even managed to open the box. But their success rate still did not match the wolves. The dogs and wolves were also tested when no one was present. But even then, the dogs didn't paw or teat the box much more than they did when a human was present.
Answer: It made them able to compete with the wolves
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What was the effect of encouragement on the dogs?

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Article: As I was busy working on my work plan in my bedroom, I could hear my four children playing upstairs. Suddenly, I heard the children running down the stairs and shouting, "Freddie, Freddie." _ My three-year old son Freddie was lying on his side on the ground. I cried for my husband Simon to dial 999 and within minutes the air ambulance arrived. They quickly took him in the helicopter. During the flight, Freddie was looking at me and I remember thinking was a good sign, but then his eyes began to roll. As the doctors tried to stabilize him, I couldn't believe what was happening. When we arrived at the hospital in Portsmouth, there were some doctors and nurses waiting for us and they immediately set to work on Freddie. I was hopelessly wishing everything would be alright, but Freddie had broken his skull in two places and blood clots were forming in his brain. He needed surgery , and only a surgeon at another hospital in Bristol could do it. This meant another helicopter ride, but we couldn't go with Freddie because there was no enough space. Simon and I drove the long 130 miles from our home in north Devon in silence. Neither of us dared say what we were thinking, "What if we get there and he's dead?" "Is he going to be brain-damaged?" Freddie was just coming out of surgery when we arrived. The surgeon said it had gone well. When I finally saw him, I hardly recognize my child--he was covered in tubes and there were wires coming out of his head. On the third day, Simon went home to see our three girls and to pick up some clean clothes for us. While he was gone, the pressure in Freddie's brain suddenly increased. He was taken into theater again and this time I fell apart. Luckily, the surgery managed to stabilize Freddie. After almost a week, Freddie was finally woken up. When he opened his eyes, he looked at me. He didn't say anything, but I knew straight away that it was my old Freddie, and that he was going to be alright. Over the next two weeks, his recovery went well. After help with learning to swallow again and encouragement with speaking, he was soon playing with his Gruffalo cards and eating meals by himself. I still don't know how the accident happened, but we got some idea from our girls. Clearly Freddie and Minnie had been sitting on the window ledge, and Freddie must have opened it to look out and fallen 20 feet onto the ground below. The guilt I feel is awful-- for weeks I was full of " if onlys", and we put window locks everywhere. Six months later, although the accident seems a lifetime ago, it has changed me. I feel differently about life now. I've left my job to put my children first. I want to spend every minute with them.
Answer: Because no surgeons in the first hospital could do surgery on the author's son.
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Why did the author's son have to be moved to another hospital in Bristol?