I still clearly remember that day. I was on the side of the road for about four hours with my big jeep. I put signs in the windows that said,“Need a jack (千斤顶）.”

    As I was about to give up, a truck stopped and a man got off. He looked at the situation, made a judgment and went back to take a jack. After about two hours, we finished the job with sweats. We were both dirty. His wife took a large bottle of water for us to wash our hands.

    I tried to put $20 in the man's hand, but he wouldn't take it, so I went to give it to his wife quietly. I asked their little girl where they lived. She said they lived in Mexico. They were in Oregon now, so Mommy and Daddy could pick cherries for the next few weeks. After that, they were going to pick peaches and then go home.

    After I said goodbye and started going back to my jeep, the girl ran to me and handed me a tamale(玉米粽子)for lunch. I thanked them again and walked back to my jeep. When I opened the tamale, what did I find inside? My $20! I ran to the truck and the guy rolled down his window. He started shaking his head, smiled and  said in English“Today you, tomorrow me. ” Then he drove away, with his daughter waving to me from the back.

    This family, working on a seasonal basis where time is money, took a couple of hours to help a stranger while others passed by quietly.

    Since then I've helped many people like the Mexican family. I didn't accept their money. Every time I was able to help, I felt as if I was putting something in the bank.

    Why do some people live to be older than others? You know the standard explanations: keeping a moderate diet, engaging in regular exercise, etc. But what effect does your personality have on your longevity?Do some kinds of personalities lead to longer lives?A new study in the Journal of the American Geriatrics Society looked at this question by examining the personality characteristics of 246 children of people who had lived to be at least 100.

    The study shows that those living the longest are more outgoing,more active and less neurotic (神经质的) than other people.Long-living women are also more likely to be sympathetic and cooperative than women with a normal life span.These findings are in agreement with what you would expect from the evolutionary theory: those who like to make friends and help others can gather enough resources to make it through tough times.

    Interestingly, however, other characteristics that you might consider advantageous had no impact on whether study participants were likely to live longer.Those who were more self-disciplined,for instance,were no more likely to live to be very old.Also,being open to new ideas had no relationship to long life,which might explain all those bad-tempered old people who are fixed in their ways.

    Whether you can successfully change your personality as an adult is the subject of a longstanding psychological debate.But the new paper suggests that if you want long life,you should strive to be as outgoing as possible.

    Unfortunately, another recent study shows that your mother's personality may also help determine your longevity.That study looked at nearly 28,000 Norwegian mothers and found that those moms who were more anxious, depressed and angry were more likely to feed their kids unhealthy diets.Patterns of childhood eating can be hard to break when we're adults,which may mean that kids of depressed moms end up dying younger.

    Personality isn't destiny(命运),and everyone knows that individuals can learn to change.But both studies show that long life isn't just a matter of your physical health but of your mental health.

    Li Hua is currently studying at Cambridge, UK. She has bought a bicycle and is worried about security. Her friend, Kate, found this article and sent it to her.

    Introduction

    A lot of crime is against bicycles. About 150, 000 bicycles are stolen every year and most are never found. You can prevent this happening by following a few careful steps.

    Basic Security

    Do not leave your bicycle in out-of-the-way places. Always lock your bicycle when youleave. Secure it to lampposts or trees. Take off smaller parts and take them with you, for example lights and saddlesleave（车座）.

    Locks

    Get a good lock. There are many different types in the shops. Buy one that has been tested against attack. Ask for a recommendation from a bike shop.

    Marking

    Security marking your bike can act as a deterrent to a thief. It can also help the police find your bicycle. It should be clearly written and include your postcode and your house or flat number. This will provide a simple way to identify your bicycle.

    Registration (登记)

    There are a number of security companies who will help mark your bicycle for you. They will then put your registration number and personal details on their computer database. Then if your bicycle is found it will be easy to contact you.

    Finally

    Keep a record of the bicycle yourself: its maker, model and registration number. You can even take a photograph of it. This will prove the bicycle belongs to you.

    It has taken an extremely long time－161 years－but the National Portrait Gallery finally has the Duke(公爵)of Wellington in its collection after a fundraising campaign reached its ￡1. 3m target.

    The gallery announced on Thursday that it had acquired Sir Thomas Lawrence's unfinished final painting of a man regarded as Britain's greatest soldier after a successful appeal.

    Nicholas Cullinan, the gallery's director, said the NPG had been looking for a suitable painting of the Duke of Wellington since the gallery was founded in 1856.

    He called it "a remarkable painting", while Lucy Peltz, the gallery's senior manager of 18th­century paintings, said the work was "an inspiring and powerful image of one of the most influential men of the 18th and 19th centuries".

    The NPG announced last November that it needed to raise ￡300,000, the final piece of a funding jigsaw(拼图). The Art Fund had already contributed ￡350,000 and the appeal reached its target thanks to ￡200,000 from the G&K Boyes charitable trust and ￡180,000 from the National Heritage Memorial Fund. A further ￡570,000 came from a public appeal and the gallery's own funds.

    It was painted in 1829 when Wellington was prime minister, however, Lawrence died in 1830 leaving the portrait unfinished. The gallery believes it is a more attractive work because of that, with the viewer focusing more on the man himself rather than any clothes of power.

    Dan Snow, the historian and broadcaster, said Wellington was a "Titanic figure" in British history, the only field greatest prime minister, a man of genius on and off the battlefield. He added:" This arresting portrait must sit in the national collection and now, following an outpouring of donation, it will do. The artist has caught the Duke's legendary features. Among his many contributions to British life he formed the culture of unbending spirit in the face of difficulty."

    The painting was lent to the NPG in 2015 for an exhibition marking the Battle of Waterloo.

    In its early history, Chicago had floods frequently, especially in the spring, making the streets so muddy that people, horses, and carts got stuck. An old joke that was popular at the time went something like this: A man is stuck up to his waist in a muddy Chicago street. Asked if he needs help, he replies, "No, thanks. I've got a good horse under me."

    The city planner decided to build an underground drainage （排水） system, but there simply wasn't enough difference between the height of the ground level and the water level. The only two options were to lower the Chicago River or raise the city.

    An engineer named Ellis Chesbrough convinced the city that it had no choice but to build the pipes above ground and then cover them with dirt. This raised the level of the city's streets by as much as 12feet.

    This of course created a new problem: dirt practically buried the first floors of every building in Chicago. Building owners were faced with a choice: either change the first floors of their buildings into basements, and the second stories into main floors, or hoist the entire buildings to meet the new street level. Small wood-frame buildings could be lifted fairly easily. But what about large, heavy structures like Tremont Hotel, which was a six-story brick building?

    That's where George Pullman came in. He had developed some house-moving skills successfully. To lift a big structure like the Tremont Hotel, Pullman would place thousands of jackscrews (螺旋千斤顶) beneath the building's foundation. One man was assigned to operate each section of roughly 10jackscrews.At Pullman's signal each man tured his jackscrew the same amount at the same time, thereby raising the building slowly and evenly. Astonishingly, the Tremont Hotel stay open during the entire operation, and many of its guests didn't even notice anything was happening.

    Some people like to say that every problem has a solution. But in Chicago's early history, every engineering solution seemed to create a new problem. Now that Chicago's waste water was draining efficiently into the Chicago River, the city's next step was to clean the polluted river.

Do you know that junk food isn't healthy? Of course you do! Do you eat it anyway? Of course you do! But a new study shows teaching adolescents about the ways food companies fool them into thinking junk food is cool can encourage kids to fight back—by eating healthier.

The pull of junk food can be super-strong. It's designed to be tasty, which makes eating well one of the great health challenges of our time. Everyone from doctors to the government has been trying to handle it. Yet we keep eating junk food.

Professor Christopher Bryan says, "Food companies want you to want junk food." They spend millions of dollars coming up with new ways to promote junk food consumption. They hire scientists to make new junk food almost irresistible. They might do this, for example, by adding more sugar. Rats fed junk food for six weeks will even walk across a floor that gives them electric shocks just to get more of such food.

Food ads often make unhealthy junk food seem healthy by featuring professional athletes, fit-looking pop stars and smiling, active teens. "We thought when the students learned this, it would matter to them," Bryan says. He worked with 8th graders at a Texas school. Half of them got a lesson Bryan created. It focused on the ways junk food is advertised, or marketed. A second group received lessons that focused on health. These lessons informed students junk food is bad, and that foods like apples or carrots are a better choice. The students learned a bad diet can lead to major weight gain, and that being overweight puts people at risk for serious diseases. They also learned how eating well now can keep you healthy when you're older.

After the lessons, the kids in both groups were asked how they felt about junk food. Most didn't have positive feelings about these unhealthy foods.