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.

Article: Air traffic controllers in the US have been advised to take 26-minute naps , after a series of accidents involving workers falling asleep. Now the National Transportation Safety Board (NTSB) is calling for "controlled naps" during nightshifts . NTSB member Mark Rosekind said that a 26-minute nap would improve performance by 34%. He believes that beyond the aviation industry, other professions, such as motoring and machinery, also carry obvious risks. But other experts doubt whether 26 minutes is the appropriate napping time. It's a bit too long and risks you falling into a deep sleep, says Jim Horne, director of the Sleep Research Council. He said, "A nap of about 15 minutes is best; once you get beyond 20 minutes, you risk a deep sleep and you can be much more tired when you wake up. Therefore, we suggest that a nap be combined with a cup of coffee so that you can enjoy an effective sleep before the caffeine takes effect in 20 minutes. However, this method only works on those who have had a poor night's sleep. If you haven't had a sleep the night before, this method won't be enough to make you fresh." Health writer, Linda Wasmer Andrews, also believes that 26 minutes is too long. She says a nap between 10 and 20 minutes is enough, and the timing of the nap is also important. Putting your head down too early means your body may not be ready to sleep yet, but a nap that is too late in a day might make it harder to fall asleep. Early afternoon is often the best time, between l pm to 3pm, when people experience a post-lunch decrease in energy.
Answer: How long a nap should last.
What does the text mainly talk about?

Article: I have never understood why so many people visit Rome from late spring to early autumn, when traffic, heat and stressed shopkeepers and waiters lead to the lower tone of the city. Things improve a little in March, April, October and November. But connoisseurs know that winter is the best time to go there. In winter, the low-flying sun turns Rome into a wonderful stage set. There are days in winter when the sky is kind of blue. And there are also days when you find that you have beautiful sights all to yourself. Perhaps the only period you might want to avoid is the two weeks before Christmas. Italians often leave their shopping late, and traffic in the city is often heavy. But this can also be a good time to come if you are more interested in culture than in fashion shops; if you stay somewhere central, you can beat the traffic by walking everywhere. Christmas in Rome is a low-key family event. One of the nice things is the way the city keeps going. Although museums and shops are closed, many bars and restaurants stay open, and public transport continues to run. If you are lucky with the weather, it's in January and February that Rome is at its best. Late February can be especially attractive. One sometimes forgets what a difference that extra hour of daylight makes compared with mid-December. And there are always a few days of proper sunshine, when you can picnic in Villa Borghese and Pompeii.
Answer: Mid-winter.
In which of the following periods would the writer most probably advise us to visit Rome?

Article: Many expensive nutrition additives advertised on TV say they can improve your memory. But only ordinary food and healthy habits have been shown to work. A research team from UCLA (University of California at Los Angeles) has designed a four-step plan to improve your memory in just 14 days. "It sounds like another advertisement, but it really works," says UCLA psychiatry professor Gary Small. The team found the four-step plan improved memory function in teenagers under stress and older people. After a two-week study that included brain-teasers , exercise and diet changes, test subjects' memories worked more efficiently. Here's the programme: Memory training: Train yourself with brain-teasers, crossword puzzles and memory exercises that train verbal skills throughout the day. Healthy diet: Eat five rather than three meals a day. The food should be rich in omega-3 fats (omega-3), such as whole grains and vegetables that contain antioxidants . Having frequent meals helps increase blood glucose , the primary energy source for the brain. Physical fitness: Have regular physical exercise such as walking, basketball or running, every day. Stress reduction : Perform stretching and relaxation exercises. Stress causes the body to release a chemical that can shrink the memory centres in the brain. Before-and-after brain scans showed that test subjects experienced on average a 5 per cent increase in working memory. This suggests they were using their brains more efficiently. They also performed better on a cognitive test. A control group that didn't follow the plan showed no big changes. "We've known for years that diet and exercise can help people keep their physical health, which is a key part of healthy aging," said Small. "But keeping mental health is just as important. Now we have evidence that people can improve their memories through a programme of memory exercises and stress reduction."
Answer: He is satisfied with his programme.
Why did Small say " It sounds like another advertisement, but it really works"?