You can tell a lot about people by looking at their hair – not just whether they brush, spray or blow-dry. Scientists have found a way to use hair to figure out where a person is from and where that person has been. The finding could help solve crimes, among other useful applications.

    Water is central to the new technique. The liquid makes up more than half an adult human's body weight. Our bodies break water down into hydrogen(氢) and oxygen. Atoms of these two elements end up in our tissues, fingernails, and hair.

    But not all water is the same. Hydrogen and oxygen atoms can vary in how much they weigh. In the case of hydrogen, for example, there are three types according to their weights. Each type is called a hydrogen isotope（同位素）. And depending on where you live, tap water contains different isotopes.

    Can hair record this information? That's what James R. Ehleringer, an environmental chemist at the University of Utah, wondered. To find it out, he and his colleagues collected hair from hair stylists in 65 cities across the United States. Even though people drink a lot of bottled water these days, the researchers have found that people's hair has the same isotopes as found in local tap water. That's probably because people usually cook their food with the local water.

    Authorities can now use the information to analyze hair samples from criminals or crime victims and narrow their search for clues. For example, one hair sample used in Ehleringer's study came from a man who had moved from San Francisco to Salt Lake City. As his hair grew, it reflected his change in location.

    A Canadian woman who lost her diamond ring 13 years ago while cleaning her garden on the family farm is wearing it proudly again after her daughter-in-law pulled it from the ground or a carrot.

    Mary Grams, 84, said she can't believe the lucky carrot actually grew through and around the diamond ring she had long given up hope of finding. She said she never told her husband, Norman, that she lost the ring, but only told her son. Her husband died five years ago.

    “I feel glad and happy, ”Grams said this week . “I grew into the carrot. I feel it amazing”,

    Her daughter-in-law, Calleen Daley, found the ring while getting carrots in for supper with her dog Billy at the farm near Armena, Alberta, where Grams used to live. The farm has been in the family for 105 years. Daley said while she was pulling the carrots and noticed one of them looked strange She almost fed it to her dog bu decided to keep it When she was washing ;the carrots she noticed the ring and spoke to her husband, Grams'son, about what she had found.

    They quickly called Grams. “I told her we found her ring in the garden She couldn't believe it, ”Daley said. “It was so strange that the carrot grew perfectly through that ring. ”

    Grams said she wanted to try the ring on again after so many years with her family looking on, she washed the ring with a little soap to get the dirt off. It moved on her finger as easily as i did when her husband gave it to her.

    “We were laughing, ” she said. “It fits. After so many years it still fits perfectly.”

    At 2:30 on December 5,1945, five US Navy training planes took off in clear weather from the base Lauderdale, Florida. The planes flew cast over the coast...and disappeared. The group was Flight 19, on a run between Florida and Bahamas. Tailor was the group leader. At about 3:40, Tailor reported that his compasses were not reading properly. The other planes followed their leaders aimlessly, first east, then west, then northeast over the ocean, as Tailor tried to make sure of the direction by radio. Then, suddenly Tailor was heard to give orders to dive...

    Quickly, two giant Martin seaplanes were sent up to search for Flight 19. Several hours later, the wind became strong and visibility (能见度) dropped. A return to base was ordered. But only one of the Martin seaplanes landed. Four days later, the Navy and Coast Guard combed a 100,000 square miles area with more than 100 planes and ships. No sign was ever shown of the missing planes.

Today, people have noted the disappearance of many ships and planes in the southwest part of the North Atlantic and began to call this area the Bermuda Triangle(百慕大三角区).

    The points of the triangle are Bermuda, Puerto Rico and a spot in the Gulf of Mexico, west of Florida. It is a two-faced water world of tiny islands, bright beaches and beautiful waters. Yet thick fogs, powerful currents(激流) and sudden storms are hidden behind this smiling surface.

    Here is a record of the discussion about AI (artificial intelligence) conducted by several scientists:

    Scientist A: I would say that we are quite a long way off developing the AI, though I do think it will happen within the next thirty or forty years. We will probably remain in control of technology and it will help us solve many of the world's problems. However, no one really knows what will happen if machines become more intelligent than humans. They may help us, ignore us or destroy us. I tend to believe AI will have a positive influence on our future lives, but whether that is true will be partly up to us.

    Scientist B: I have to admit that the potential consequences of creating something that can match or go beyond human intelligence frighten me. Even now, scientists are teaching computers how to learn on their own. At some point in the near future, their intelligence may well take off and develop at an ever-increasing speed. Human beings evolve biologically very slowly and we would be quickly substituted. In the short term, there is the danger that robots will take over millions of human jobs, creating a large underclass of unemployed people. This could mean large-scale poverty and social unrest. In the long term machines might decide the world would be better without humans.

    Scientist C: I'm a member of the Campaign to Stop Killer Robots. Forget the movie image of a terrifying Terminator stamping on human skulls and think of what's happening right now: military machines like drones, gun turrets and sentry robots are already being used to kill with very little human input. The next step will be autonomous “murderbots” following orders but finally deciding who to kill on their own. It seems clear to me that this would be extremely dangerous for humans. We need to be very cautious indeed about what we ask machines to do.

    On the last day before Christmas, I hurried to the supermarket to buy Christmas gifts. In the supermarket, I noticed a little boy, holding a doll and looking so sad. He turned to the old woman next to him, “Granny, are you sure I don't have enough money?” The old lady replied, “You know we don't have enough money to buy this doll, my dear.” Then she left for something else and the boy still stood there.

    Finally, I went to the boy and asked him who he wanted to give this doll to. “It is the doll that my sister wanted so much for this Christmas. She was so sure that Father Christmas would bring it to her.”

    I told him that maybe Father Christmas will bring it to her. But he replied to me sadly, “No, Father Christmas cannot bring it to her where she is now. I have to give the doll to my mother so that she can give it to her when she goes there. My sister has gone to be with God. Daddy says that Mummy will also go to see God very soon, so I thought that she could bring the doll with her to give it to my sister.”

    Hearing this, I quickly reached into my wallet and took a few notes and said to the boy, “What if we checked again, just in case if you have enough money?”

    “OK,” he said, “I hope that I have enough.”

    I added some of my money to his without his seeing and we started to count it. There was enough for the doll.

    The little boy said, “Thank God for giving me enough money.”

    Then he looked at me and added, “I prayed to God yesterday before I slept to make sure I have enough money to buy this doll. He heard me.”

    Yoga is an ancient physical and spiritual practice originating in India. The word '"yoga" comes from Sanskrit (梵文) and means to join or to unite, symbolizing the union of body and mind. Today it is practiced in various forms around the world and continues to grow in popularity. Recognizing its universal appeal, the United Nations declared 21 June as the International Day of Yoga in 2014 to raise awareness worldwide of the many benefits of practicing yoga.

    Yoga is an invaluable gift from an ancient tradition. It's not just about exercise but a way to discover the sense of oneness with yourself nature and the world. There is no written record of who invented yoga. Yoga practitioners (从业者) passed down the principles to their students. The earliest written record of yoga is generally believed to have been written by Patanjali, an Indian master who lived somewhere between 2,000 and 2,500 years ago.

    Various yoga types give you multiple choices. Hatha yoga is the most widely practiced type and is excellent for beginners. It is gentle with slow and smooth movements. Kundalini yoga combines a singing session besides body and mental control. Bikram yoga is practiced in a heated room. It is to loosen muscles and to sweat to clean the body and remove symptoms of disease and pain. Ashtanga yoga is taught as a difficult workout where you move quickly from one gesture to another to build strength and patience.

    In recent years, the World Health Organization has urged countries to help their citizens reduce physical inactivity, which is among the top ten leading causes of death worldwide, and a key risk factor for non-communicable diseases, such as cancer and diabetes. Yoga is a proper exercise. It is known for its ability to ease stress and anxiety. It may also help reduce several risk factors for heart diseases and promote a better sleep.