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: As many people hit middle age, they often start to notice that their memory and mental attention are not what they used to be. We suddenly can't remember where we put the keys just a moment ago, or an old friend's name, or the name of an old band we used to love. It happens to most of us, but is it unavoidable? Scientists are increasingly showing that there's actually a lot that can be done. It turns that the brain needs exercise in much the same way as our muscles do, and the right mental workouts can improve our basic cognitive functions. Now, a new San Francisco Web-based company has taken it a step further and developed the first "brain training program" designed to actually help people improve and regain their mental sharpness. Called Lumosity, it was designed by some of the leading experts from Stanford University. Lumosity is far more than an online place to exercise your mental skills. That's because they have combined these exercises with a Web-based program that allows you to systematically improve your memory and attention skills. Apparently it works. One study showed students improved their scores on math tests by 34 percent after using Lumosity for six weeks, greater gains than those made by other students in the same class, who were not training with the Lumosity program. The company says its users have reported clearer and quicker thinking, improved memory for names, numbers, directions, increased alertness and awareness, high mood, and better concentration at work or while driving.
Answer: To improve students' scores on test.
What is the purpose of Lumosity?

Article: When policy experts debate climate change solutions, they often talk about "a price on carbon." They are arguing about whether companies should pay when they put carbon pollution in the air. Proponents say that it's simple economics -- if it's free to pollute, you'll get a lot of pollution. Opponents claim it will raise the cost of energy that's produced from high carbon sources, like coal. But here's the secret that most people seem to be missing: There already is a price on carbon, and it's paid by the taxpayers. Carbon pollution, like every other form of pollution, has an impact on the environment. Throwing waste into a river will cause the fish to die and the people who drink the water to get sick. And when you produce carbon pollution, you get climate change -- sea level rise, stronger storms, severe droughts, damage to agriculture, and more. All of those impacts cost money. Insurance rates go up when storms get more destructive. Taxes increase when cities have to rebuild bridges and roads. Military budgets go up when droughts and population changes cause conflicts. Not to mention impacts on agriculture and health care costs. In other words, the price on carbon is what we all pay when there is no market force to limit the pollution that causes climate change. So the debate is really about who will pay that price -- the companies who are making a profit from the fossil fuels, or the taxpayers who pick up the cost now? Right now, we have private profit and public cost. It's just like if we allowed every business to throw its garbage in the street because it's too expensive to have it moved away properly. Does it add a little bit to your dinner check to require that restaurants dispose of their trash properly? Sure. But it would be more expensive for you if the city had to clean the streets of their garbage every day. So just like we put a "price on garbage" we need a "price on carbon pollution." Now, a "price on carbon pollution" can mean a lot of things. You could tax companies based on the amount of carbon pollution they produce, and return the money to taxpayers. You could put a limit on how much they can produce, thereby requiring them to invest in ways to conduct business in a less polluting way.
Answer: Whether the companies should pay for it.
What do the policy experts argue about carbon pollution?

Article: The tough economy is bringing new shoppers to the secondhand market. Plato's Closet in Charlotte, NC is a private company which mainly buys and sells used clothes. While Charlotte has outstanding secondhand stores offering high-end and sophisticated brands for women, most of their stock applies to adults. Plato's Closet targets teens and those in their 20s.Plato's Closet, with stores in Matthews and the university area, sells clothes and accessories that are currently popular at up to 70 percent off retail prices . The two hottest brands, for buying and selling, are Hollister and Abercrombie & Fitch. Even though the offerings tend to be suitable for young people, there are a variety of shoppers at Plato's Closet of varying ages. Women in their 30s; 40s and older could easily find a purse, jacket or piece of jewelry they like. Customer Beth Gibbs, 52, who has three teenage daughters, said she used to shop at name-brand stores, but "this year I'm shopping more in secondhand stores", because of the economy. If you're selling Unlike higher-end resale stores which usually work on consignment , Plato's Closet buys on the spot. Items can be gently used, but must be in very good condition. Clothes should be less than two years old and styles should be the same as those still being sold at the shopping center. There is no negotiation; prices are set company-wide. If what you sell amounts to $30 or less, they'll give you cash. More than that, you'll get a Visa cash card. Secondhand success Don't get discouraged if you can't find something on your first trip. Resale shops are always getting new lists of goods and change their styles with each season. Be sure to check each piece carefully before buying. Price comparison Jackets: New York & Company black blazer, $12; retail: $37. Pants: Express Editor-style pants, $12; retail: $69.90. Shoes: Nine West black peep-toe pumps, $12; retail: $89. Jewelry: Necklaces, $3-$5; retail: $18-$30. (365)
Answer: They offer service for people of different ages.
What is the difference between Plato's Closet and other resale shops?