Article: Can trees talk? Yes, but not in words. Scientists have reasons to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First a willow tree attacked in the woods by caterpillars changed the chemistry of its leaves and made them taste so terrible that they got tired of the leaves and stopped eating them. Then even more astonishing, the tree sent out a special smell---a signal causing its neighbors to change the chemistry of their own leaves and make them less tasty. Communication, of course, doesn't need to be in words. We can talk to each other by smiling, raising our shoulders and moving our hands. We know that birds and animals use a whole vocabulary of songs, sounds, and movements. Bees dance their signals, flying in certain patterns that tell other bees where to find nectar for honey. So why shouldn't trees have ways of sending messages? Question: The willow tree described in the passage protected itself by _ . Yes or no, is the answer "changing its leaf chemistry"?
Yes

Article: Speaking two languages can actually help offset some effects of aging on the brain, a new study has found. Researchers tested how long it took participants to switch from one cognitive task to another, something that's known to take longer for older adults, said lead researcher, Brian Gold, a neuroscientist at the University of Kentucky. Gold's team compared task-switching speeds for younger and older adults, knowing they would find slower speeds in the older population because of previous studies. However, they found that older adults who spoke two languages were able to switch mental activities faster than those didn't . The study only looked at life-long bilinguals, defined in study as people who had spoken a second language daily since they were at least 10 years old. Gold and his team asked 30 people, either bilingual or monolingual , to have a series of tests. They found that bilingual people were not only able to switch tasks faster, they had different brain activity than their monolingual peers. Kristina called bilingualism "a beautiful natural experiment", because people grow up speaking two languages,and studies have shown that they get certain cognitive benefits from switching between languages and determining which to respond with based on what's going on around them. Gold said he grew up in Montreal, where he spoke French at school and English at home, prompting relatives to question whether his French language immersion would somehow hinder his ability to learn English. "Until very recently, learning a second language in childhood was thought of as dangerous," he said. "Actually, it's beneficial. " Question: In Gold's opinion, learning a second language in childhood is _ . Yes or no, is the answer "not dangerous but beneficial to children"?
Yes

Article: After years of hearing drivers complain about scratches on their cars, Japan's Nissan Motor Company has officially announced the next big thing---a paint that not only resists scratches and scrapes, but actually repairs itself within a few days. The new material, developed by Nippon Paint Company, contains an elastic rubbery-like resin that is able to heal minor marks caused by car wash equipment, parking lot encounters, road debris or even on-purpose destruction. The automaker admits its results vary depending on the temperature and the depth of the damage, but adds this is the only paint like it in the world, and tests prove it works. Minor scratches, the most common type, are said to slowly fade over about a week. And once they're gone, there is no trace that they were ever there. The special paint is said to last for at least three years after it is first applied, but there is no word yet on whether more can be added after that period. Nissan claims car washes are the worst offenders for this type of damage, accounting for at least 80 percent of all incidents. But the complete auto-healing won't come without scratching your wallet. The vehicle maker notes the special paint adds about $ 100 U.S. to the price of a car. It plans to use its new chemical mixture only on its X - Trail SUVs in Japan for now, as it looks for a more widespread presentation. And while plans to offer the feature overseas haven't been made yet, if it's a hit there, you can be almost sure market forces will drive it to these shores, as well. Question: The paint used on cars can _ . Yes or no, is the answer "help to protect cars from minor paint damage"?
No