You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Answer: whether mood affects their learning ability
Solution: Researchers did experiments on kids in order to find out _ .
Why? It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

New input: Article: One of today's hottest topics among women (and to an extent among men too now) is anti aging and how to reverse the signs of age.The beauty industry has responded to this by offering a wide collection of anti aging creams and other anti aging products aimed at all pocketbooks,ranging from economical to highly priced. And the question is "do any of these often much-vaunted anti aging creams actually work?" And if they do,how precisely do they perform their miracles? Well the appropriate response to that is that they do work - after a fashion.There certainly are anti aging creams available for a ly modest price that will reduce the appearance of wrinkles in a comparatively short period of regular application.But this really is the limit of their powers: they won't actually undo skin damage or eradicate all signs of age;they will simply modify them,some more effectively than others. The way they work is like so: they remove upper layers of dead skin cells and make deeper layers absorb water,serving to plump them up and make them look fuller and healthier.But since such anti aging creams only go skin deep,as it were,skin damage will reappear once you stop using the anti aging wrinkle cream. This means fairly heavy regular use,which might be costly depending on your choice of product.However,if you can afford it or think it's worth the cost,it won't be such an issue.After all,what woman wants to look older than her years when looking good is so tied up with many women's self-esteem and sense of identity. A compromise solution for those _ is to use the cheaper creams.In addition,it's always wise to be a little experimental to make sure you end up with the one that suits your skin best. So,to sum up: an anti wrinkle face cream will work within limits,depending on your objective.
Answer: anti aging creams
Solution:
This passage mainly tells us something about _ .