Article: Nearly all of today's Native Americans in North, Central and South America can trace their ancestry to just six women whose descendants immigrated around 20,000 years ago, a DNA study suggests. The finding does not mean that only these six women gave rise to migrants who crossed into North America from Asia in the earliest population of the continent.Rather, it suggests that only six left a particular DNA legacy that persists to today in about 95% of Native Americans, said study co-author Ugo Perego in Utah. "The women did not necessarily arrive together, nor even all live at the same time," he said.Results indicate the women arrived sometime between 18,000 and 21,000 years ago. The work was published this week by the journal PLoS One.Perego is from the Sorenson Molecular Genealogy Foundation in Salt Lake City and the University of Pavia in Italy.The work confirms the previous indications of just six maternal lineages, as well as a date of around 20,000 years ago when the first people in North America arrived after crossing a land bridge from Asia, Perego said. The researchers studied mitochondrial DNA, which is passed only from mother to daughter.They created a "family tree" that traces the different DNA _ found in today's Native Americans.By noting mutations in each branch and applying a formula for how often such mutations arise, they calculated how old each branch was.That indicated when each branch arose in a single woman. The six "founding mothers" obviously did not live in Asia because the DNA signatures they left behind are not found there, Perego said.So they probably lived in Beringia, the now-submerged land bridge that stretched to North America, he said. Question: What didn't Ugo Perego and his team do? Yes or no, is the answer "They focused on life styles of the original women."?
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Article: March is a month of fun-filled activities for the entire family! When you want some family fun activities for March, consider these ideas centered on some of the events and holidays happening in this month. Dr. Seuss's Birthday March 2ndis Dr. Seuss's birthday and kids and adults of all ages can celebrate with books, games and more to honor this famous author of kids' books. Take some time in March to read your favorite books with your children or to read some you have never read before. Spring Break Spring Break can be the perfect time for families while the children are out of school. There are many places for families during this time period. For example, you might consider a trip to a local theme park or a national park. They often run junior camps and other activities during Spring Break that you can enjoy as a family. St. Patrick's Day St. Patrick's Day is on March 17thand you don't have to be Irish to enjoy this holiday. This is a great time to get all the family together to enjoy quality time together. You can also take this time to explore the holiday, its history and what it means. You can also start or continue with your own St. Patrick's Day traditions that your family can continue year after year. Seasonal Arts and Crafts Arts and crafts can be a fun family activity all year round. So if you're looking to spend this fun time together in March, you can look for some seasonal arts and crafts ideas. You can do early preparation for Easter, spring plants and pictures, sun catchers for hanging in the windows or other seasonal related ideas. This is also a great time to consider planting a flower garden or working on outdoor craft projects. Question: What can be done on Dr. Seuss's Birthday? Yes or no, is the answer "Finding some books to read."?
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Article: Hong Kong businesses hit by nearly two months of illegal street occupations breathed a collective sigh of relief on Wednesday. Police finally cleared illegal protesters camped at the main intersection in the Mong Kok district, arresting two student leaders. More than 7,000 officers backed bailiffs (,)clearing occupied sections of Argyle Street and Nathan Road. The two-day operation saw 148 people arrested for various offenses, including contempt of court, resisting arrest, possession of offensive weapons, unlawful gathering and attacking police. The Chief Leader Stephen Hui said 22 officers were injured during the clearances. Police used pepper spray and batons to keep protesters from reclaiming cleared roads and from spreading the illegal occupation to neighboring streets. Six-lane Nathan Road, which goes through the heart of Kowloon, was cleared after nearly five hours. However, comments on the Internet said protesters were looking to reoccupy roads later in the evening. This week's actions mark the first time the authorities have successfully cleared one of the three main protest sites, which sprang up after demonstrators seized key intersections in late September to press for unconstitutional reforms. Contractor Kwan Sui-sum, 55, said he wished the Nathan Road clearance had come earlier, as he has had to pay HK$20,000 ($2,580) after the protesters delayed building reconstruction work. The owner of the Chung Hing Duty Free drug store was cautiously optimistic and eager for his store at the corner of the cleared intersection to get back to business. Sales dropped by 40 percent during the occupation, he said. "I'm not worried about the guess that the protesters will return. I trust in Hong Kong's rule of law and in the police," the man said, who wished to remain unknown as he fears attack from protesters. But five stores at a cleared site owned by jewelry chain Chow Tai Fook were still closed hours later. A company spokesman said the outlets will remain shut while it continues to monitor the situation. Question: This passage is mainly about _ . Yes or no, is the answer "the event that police cleared Hong Kong protest sites"?
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Article: Against the supposition that forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space. This finding suggests that taking steps to prevent northern forest fires to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over the next several centuries as a result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling. This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat. Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling. "We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere." Scientists tracked the change in the amount of radiation entering and leaving the climate system as a result of the fire, and found a measurement closely related to the global air temperature. Typically, fire in northern regions occurs in the same area every 80 to 150 years. Scientists, however, found that when fire occurs more frequently, more radiation is lost from the earth and cooling results. Specifically, they determined when... Question: .Earlier studies about northern forest fires _ . Yes or no, is the answer "suggest that the fires will speed up climate warming"?
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