Article: SALT LAKE CITY, March 1, 2010 --- Like silkworm moths , butterflies and spiders, caddisfly larvae spin silk, but they do so underwater instead of on dry land. Now, University of Utah researchers have discovered why the fly's silk is sticky when wet and how that may make it valuable as an adhesive tape during an operation. "Silk from caddisfly larvae may be useful some day as a medical adhesive for sticking wet tissues," says Russell Stewart, an associate professor of bioengineering and principal author of a new study of the fly silk's chemical and structural properties. "I picture it as sort of a wet Band-Aid, maybe used inside in operations --- like using a piece of tape to close a cut," he adds. "Gluing things together underwater is not easy. Have you ever tried to put a Band-Aid on in the shower? This insect has been doing this for 150 million to 200 million years." There are thousands of caddisfly species worldwide. Some species spend their larval stages developing underwater, and build an inch-long, tube-shaped case or shelter around themselves using sticky silk and grains of rock or sand. Other species use silk, small sticks and pieces of leaves. Each larva has a head and four legs that stick out from the tube.The larval case gets wider as the larva grows.A caddisfly larva eventually pupates as it develops into an adult fly and then hatches. Caddisflies now live around the world in waters ranging from fast streams to quiet low lying wet land. The caddisflies'adaptation to diverse habitats is largely due to the inventive use by their larva of underwater silk to build complex structures for protection and food gathering. Caddisflies fall into two groups. Some build their case and then drag it along with them underwater as they search for food. Some build a shelter glued to a rock,with a silk net to catch passing food. Question: The author mentioned "Band-Aid" in the passge to show _ . Yes or no, is the answer "silk from caddisfly larvae has an advantage over BandAids"?
Yes

Article: Many people think walking is a good way to exercise and many fat people are advised to lose weight by walking. In fact, you can do it everywhere. Here's how to prepare for walking: ^Find a pair of shoes. It is easy to find a pair of shoes, but what matters most is comfort. ^Check your shape. The following tips will help you stay comfortable and get the most out of your walk: * Stand up straight. Imagine a string pulling you up from the center of the top of your head. Let that string pull you up as straight as possible. Relax your shoulders. * Look ahead. Keep your neck straight and your head held high to avoid unnecessary strain to your neck and shoulders. If you have to look down to see where you're going, lower your eyes, not your head. * Move your arms. Bend your elbows and let your arms swing naturally at your sides. You'll burn up to 15 percent more calories by keeping your arms moving. ^Stay safe walking is one of the safest activities you can do. Still, it's wise to take a few precautions . * If you're walking at night, wear a piece of reflective clothing. * When the weather's warm, be sure to drink a tall glass of water before you set out and another when you return. * If your path is rough, protect your ankles. Wear a comfortable elastic bandage for support, and keep your eyes focused on the path. Question: _ is the most important when choosing a pair of shoes for walking. Yes or no, is the answer "Comfort"?
Yes

Q: Article: In Florida,one McDonald's customer started a pay-it-forward chain that inspired other 249 customers to be generous and do the same. ABC News reports the spirit of giving is in the air as 250 drive-thru customer at a local McDonald's paid for the meals of the people next to the them.Lakeland customer Torie Keene was paying for her food on Wednesday morning when she decided to pay for the meal of the car next to her. Keene then purposely told McDonald's cashier Marisabel Figueroa to greet the other customer "Merry Christmas" and not "Happy Holidays."The next customer was moved when Figueroa said her food was already paid by the previous car.That's when she thought that she would love to do the same and the domino effect followed. Figueroa,who worked from 9 a.m.to 3 p.m.on Wednesday,said that the chain reaction almost lasted for her entire shift."I just kept giving everyone the same message,and they were all so stunned and so happy,"she continued."One lady even paid for the meals of the next three cars behind her." While people were amazed by how generous they could get,Figueroa said she had "never experienced something like that before" in her 12 years of working for McDonald's."I feel very blessed to have been a part of a11 that,"the cashier said. Keene contacted Figueroa on Facebook when the pay-it-forward chain came out in the local news.She revealed that she was the "mystery customer" that started the long chain of kindness. Keene added that she was surprised by the number of people who continued her good deed when she was only trying to brighten someone's day. Question: Who started the pay-it-forward chain? Yes or no, is the answer "Torie Keene from Lakeland."?
A: No

(Question)
Article: For many men, the idea that they have a better sense of direction than women has been improved by a scientific study. Researchers from Norway scanned on the brains of volunteers as they completed navigation tasks to discover men are more skillful at finding their way because they use a separate part of their brain. According to lead researcher Dr. Cal Pintzka from the Norwegian University of Science and Technology (NTNU), men and women have different navigational strategies. Med use basic directions--the use of north, south, east and west--during navigation to a greater degree. Men's sense of direction was more effective. They quite simply got to their destination faster. "If they're going to the Students Society building in Trodheim, for example, men usually go into the general direction where it is located." Dr. Pintzka explained. Women usually orient themselves along a route to get there, for example, go past the hairdresser and then up the street and turn right after the shore. The study shows that using the basic directions is more efficient because it is a more flexible strategy. The destination can be reached faster because the strategy depends less on where you start. Meanwhile, the study also shows both men and women use large areas of the brain when they navigate, but some areas were different. The man used the hippocampus more, whereas women use their frontal areas to a greater extent. That degrees with the fact that the hippocampus is necessary to make use of basic directions. Losing one's sense of direction is one of the first symptoms in Alzheimer's disease. Understanding how men and women use different brain areas and strategies to navigate, researchers will be able to enhance the understand of the disease's development, and develop coping strategies for those already affected. Question: Why is men's strategy more efficient? Yes or no, is the answer "Because it is less limited by the starting place."?
(Answer)
No