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: The Namib Desert in Africa is one of the driest places on earth.With half an inch of rain falling every year,humans call barely survive there for a week with no water.But the Namib beetle does just fine.It collects morning dew that condenses on its back. Inspired by this little creature,27--year--old Edward Linacre,a former student from Swinburne University of Technology in Melbourne,Australia,has designed a new"Airdrop" irrigation system which can pull water from even the driest desert air.His invention won the 2011 James Dyson Award,an international design award.Hopes are high that the system will be able to solve the problems of growing plants on dry land,according to the may Mail. Linacre studied the Namib beetle and found that it had hydrophilic skin on its back,which helped catch water molecules passing in the air.These water molecules accumulated into small drops of liquid water.He realized that as long as the air temperature was low enough,even the driest air contains water molecules that can be extracted . Following this principle,he designed the new system which works by pumping air through a network of underground pipes to cool it to the point at which water condenses.The water is then delivered directly to the roots of plants. According to the research,about 11.5 milliliters of water could be collected from every cubic meter of air in the driest desert.Further development could raise that number even higher . The idea of getting water from the air is not new.However,the Airdrop has certain advantages compared with its competitors.Similar systems often require great amounts of energy because they use refrigeration equipment to lower the temperature.But Airdrop simply uses the temperature difference between the air and the cool earth underground
Answer: the beetle's hydrophilic skin matters in surviving in the desert
Solution:
From the text,we know that _ .