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.

    For years I have had no idea what I have been doing with my life. I was a 30-year-old lawyer in New York. But being a lawyer was never my dream or goal in life. I honestly wanted to be a writer. I have a great imagination and would write amazing stories in my head. But I always knew that being a writer was never possible for me because it was a better financial decision to stay a lawyer.

    Recently, I couldn't fall asleep at my usual time of 10 p. m. and when I did fall asleep I had the same dream over and over again. The dream starts with me in the ocean trying to go for a swim and I'm searching for something, but I start to drown and have no control over my body. Then a light shines through the waters and when I look up all I can see is myself in a bright white room writing a novel. Then I hear a voice say repeatedly, “Now is the time to try something new!”

    It wasn't just a dream; it was my opportunity to make something good out of my life. That afternoon, I quit my job at the law firm and I couldn't have been any happier. My life started at 30, and every day since that point I haven't stopped enjoying life. I started to write and have been on the best-sellers list for the last two months. Things have definitely turned around.

    Change is a good thing; it gives us an opportunity to take a chance. So my two favorite words I live by and so should you are “change and chance”.

    According to new research from the University of Cambridge in England, sheep are able to recognize human faces from photographs.

    The farm animals, who are social and have large brains, were previously known to be able to recognize one another, as well as familiar humans. However, their ability to recognize human faces from photos alone is novel.

    The recent study, the results of which were published in the journal Royal Society: Open Science. Show the woolly creatures could be trained to recognize still images of human faces, including those of former President Barack Obama and actress Emma Watson.

    Initially, the sheep were trained to approach certain images by being given food rewards. Later, they were able to recognize the image for which they had been rewarded. The sheep could even recognize images of faces shown at an angle, though their ability to do so declined by about 15 percent – the same rate at which a human's ability to perform the same task declines.

    "Anyone who has spent time working with sheep will know that they are intelligent, individual animals who are able to recognize their handlers," said Professor Jenny Morton, who led the Cambridge study. "We've shown with our study that sheep have advanced face-recognition abilities, comparable with those of humans and monkeys."

    Recognizing faces is one of the most important social skills for human being, and some disorders of the brain, including Huntington's disease, affect this ability.

    "Sheep are long-lived and have brains that are similar in size and complexity to those of some monkeys. That means they can be useful models to help us understand disorders of the brain, such as Huntington's disease, that develop over a long time and affect cognitive abilities. Our study gives us another way to monitor how these abilities change," Morton said.

    Some people say summer is the time when teachers should get more pay. But not everyone is grateful to teachers for keeping kids occupied (无空闲的) between August and June: Washington state representative Liz Pike has written a Facebook post, titled "A life in the day of a WA state representative," and responded to teachers' complaints of rising costs of living. The post has received criticism for being anti-teacher. After reading her post, I feel that Liz Pike should rethink her criticism of public school teaching and avoid comparing it to the private school.

    Many of us teachers would certainly like teaching to be more like the private school. We see nothing wrong with fair pay for fair performance. In fact, performance is the name of the game. With standardized testing popular throughout K-12 education, teachers are some of the most analyzed and performance-measured employees in the United States. Liz Pike is very angry that teachers want raises even while test scores are dropping. Well, how are we supposed to have discipline (纪律) in the classroom when our hands are tied and we can hardly do anything with naughty students or fail students who are not prepared to move on to the next grade?

    Teachers would love to be able to turn education around and improve student performance. But we can't, and we should not suffer for it. Unlike private school businesses, public schools cannot turn away "customers". A private school business serves customers who walk through the door of their own free will, while public schools have to educate students who only attend because courts say they must.

    She says those who are "uninspired" by a lack of a cost of living increase should give up teaching. Is this the message that she thinks should be sent to the students whose academic performance she claims (声称) to care so much about? That "if you love it you'll shut up and not stand up for yourself"? I think teachers should stand up for themselves and I also think supporting teachers can make teachers teach children how to stand up for themselves.

A new study of fifth and sixth graders in Germany examined the relation between classmates' gender stereotypes (性别刻板印象) and individual students' reading outcomes to explain how these stereotypes contribute to the gender gap in reading.

"It's a cycle of sorts," explains Francesca Muntoni, a researcher at the University of Hamburg, who leads the study. "Reading is first thought as a female advantage." It stresses that girls are born to have an advantage in reading, which in turn greatly affects boys by causing them to devalue their actual reading ability. So finally, it damages their reading motivation (积极性)."

The study has proven that boys are less motivated to read and hold weaker reading-related beliefs about their own skills if they hold the strong stereotype mentioned above. And accordingly, they perform poorly in the reading test. The effect of classmates' stereotypes is seen over and above the effect of individual stereotypes. The study found fewer individual positive effects and no effects of classmates, stereotyping on reading-related outcomes for girls.

The researchers say although their study provides evidence of lasting negative effects of stereotypical beliefs in a classroom context, they need more experimental findings on the subject. They also note that students' gender stereotypes were measured by self-reports, which might limit their accuracy. Finally, they point out that their study did not settle how gender stereotypes were formed.

"To solve socially the determined gender inequality in reading and help create classroom contexts that discourage students from acting on their stereotypical beliefs, teacher and parents may consider educating boys and girls in ways that change stereotypical behaviors. And thus students can become aware of their gender stereotypes to counteract their effects on other students' outcomes and to create a gender-fair learning environment," says Jan Retelsdorf, professor of the University of Hamburg, who co-authored the study.

Freshmen at Central Valley High in Ceres had a busy week of good deeds, tied to Pay It Forward Day, April 30, and an urge to show the world that teens can be awesome.

Kids in Success 101 spent first period making sandwiches for the homeless. The classes, taught by Natalie Rowell and Becky Lynch, got to hand 200 bagged sandwiches to the charity giving out the food. "They got to really see what an impact they had. It was inspiring and heartwarming," Rowell said. Besides, students also made blankets to send to soldiers, and created 45 flower arrangements for senior people at the Hale Aloha Home in Ceres. "They were nervous going into it. But when they saw how happy the elderly were, the reality of what they did really surfaced," Rowell said.

Rowell said she liked working with children. get to see how they learn. "It's different from how we learn, but we're kind of the same because they struggle in some of the subjects that we find hard as well."

Success 101 was tailor-made for students with that kind of insight. The first-period class includes study help, speakers on teen subjects and an overall focus on looking past high school, figuring out the steps to create their future. "Some kids need that little push. In this class, that's what we do, we give them that little push," Lynch added. "Success would be beneficial for all ninth-grade students. Since the start of the year, I really see a change in them."

Raquel Alfaro, a teen participant who worked with the younger kids, likes the Pay It Forward idea. "This helps us show adults, and also kids, that we're doing something different and that we're not as mean and selfish as they think we are," Alfaro said.