The researchers say a person loses two months for every kilogram overweight they are— and seven years for smoking a packet of cigarettes a day.

    Unusually, the Edinburgh university team found their answers by analysing differences in people's genetic code or DNA. Finally they think it will show new ways of helping us to live longer.

    The group used the genetic code of more than 600, 000 people who are taking part in a natural experiment. If someone smokes, drinks, drops out of school and is overweight, it can be difficult to identify the impact of one specific unhealthy behavior.

    Instead, the researchers turned to the natural experiment. Some people carry mutations(变异) in their DNA that increase(食欲) or make them more likely to put on weight, so researchers were able to compare those programmed to eat more with those who were not. The research team also found specific mutations in human DNA that alter lifespan (寿命).

    Mutations in a gene (a set of instructions in DNA) that is involved in running the immune system could add seven months of life on average.

    People with a mutation that increased levels of bad cholesterol knocked eight months off lifespan.

    A rare mutation in a gene—APOE—linked to dementia reduced lifespan by 11 months.

    And one that made smoking more appealing cut lives by five months.

    Dr Joshi says that while genes do influence lifespan, “you've got even more influence” through the choices you make. Dr Joshi said, “We hope to discover genes affecting lifespan to give us new information about ageing and construct treatment tor ageing.”

    There are also some disease mutations that clearly affect lifespan and to destructive effect, such as the Huntington's gene. People with Huntington's often die in their 20s.

    However, in order to follow people until the end of their lives, many of the people studied were born before 1940.

    I sit on the stoop (门廊) in front of my friend's house at the top of a steep hill. And now my friend is late, and I'm stuck here waiting.

    I see a man approaching.

    "Por favor. Call 911," the man says. "Finger. Cut." With his left hand, he is pressing the handkerchief around his right little finger.

    "No. Have. Phone," I say, as if English is also my second language.

    "Have phone," he says, and dips his chin toward his front pants pocket. There, I find a phone, and call 911.

    The operator answers, and I say "I'm with this guy, and he cut his finger."

    "Did he cut it off?"

    "Did you cut it off?"

    "Sí." He sighs.

    "Yes. He cut it off."

    "Where is it?" the operator asks.

    "Where is it?"

    "Upstairs," he says, pointing with his elbow to the house next door.

    "Go get it," she instructs me.

    I follow the man toward the house. Inside, I see a table saw(锯), and the blood spreading across the ceiling, but I don't see the finger. I lift up each foot and look underneath to be sure I've not stepped on it. I'm getting that jumpy, tight-shouldered feeling like when you've lost sight of a spider that was on your ceiling a moment ago.

    "Do you see it?" I ask him.

    He points at his own finger beside the table saw. I grab a paper towel, pinching it carefully, the way you might pick up a harmless but frightening insect.

    "We have secured the finger," I tell the operator.

    "Hang tight. The ambulance is on its way."

    We sit on the stoop waiting for the ambulance.

    "You're going to be OK," I say, putting my free hand on his sawdust-covered back.

    "Gracias," he says.

    "De nada. Esta no problemo," I reply in broken Spanish.

    It feels good to be able to comfort someone, anyone. For months now, the second my hands would go idle(闲散的), a familiar depression would climb on my back. I have been trying to put on a good face for my kid, but I feel as if I've been failing. Could I save myself? I wouldn't know how. But I am determined to save this man.

    Finally the ambulance arrives, picks him up, and they're off.

    Throughout the evening, I can't stop worrying about the man. I decide to call the hospital.

    "Hi! I helped a guy who cut off his finger, and I don't even know his name, but I'm wondering whether he came to your hospital."

    The nurse says, "His name is Jose Ramos, and he's waiting for surgery. Would you like to leave a message?"

    "No. I don't want to bother him. I just wanted to be sure he was OK."

    The next morning, I call the hospital again. This time, I'm put through to Jose's room. "How was the surgery?"

    "No surgery," he says. "No enough blood."

    "Oh, I'm sorry," I say.

    Later that day, I remember that old proverb about how if you save someone's life, you are responsible for them for the rest of their life, which never made sense to me before. Shouldn't the person who got saved owe a debt, and not the other way around? But today, I get it. It's a great honor to help someone in need.

    I start keeping a lookout for other people in need of assistance. I help push a stalled car out of the road. I aid a disoriented cyclist when her bike gets clipped by a car. I adopt a dog. Then one day, a month or two after the finger incident, I realize I have completely forgotten to be depressed. I've been so busy playing the role of local hero that I have ignored to drag my feet and stare into space and imagine the world without me.

    Now, more than a decade has passed since Jose's accident. Occasionally I search for "Jose" plus "Ramos" plus "finger." I wish I could see him again, to see how he's getting on. But more important, to thank him, because when he lost his finger, he saved my life.

    Alibaba, Bank of China and Huawei—these are the dream employers for Chinese students, according to a new survey.

    “The survey of more than 55,000 students, conducted by the research firm Universum, has found that roughly a quarter want to work for an international company, while only 9％ want to work for a start-up. Five percent want to start their own business.”

    The students said that work-1ife balance was the most important career goal, followed by job stability. When it comes to desirable companies, Bank of China has been named the top choice by business students for seven consecutive years, and the gigantic state-owned firm shows no signs of giving up its lead.

    William Wu, the China country manager for Universum, said that banking remains an attractive industry for young Chinese. “China's government is now emphasizing the revolution of the finance industry, which leaves the younger generation with the impression that although banking is a traditional industry, there are still a lot of development opportunities.” Wu said.

    E-commerce giant Alibaba (BABA, Tech30) improved six places from 2014, ranking second among business students. Alibaba's rise shouldn't come as much of a surprise—the company held a record-breaking $25 billion IPO in September.

    Among engineering students, Alibaba was once again a bridesmaid. Instead, Huawei—a telecoms infrastructure firm that now makes consumer products-took the top spot.

    “Both of these companies are pioneers in terms of local companies going international.” said Wu. “It shows that… an international development strategy has a positive influence among Chinese young talents.” Tech companies ruled the rankings for humanities students, with Alibaba—which was ninth in 2014 —landing at the top. Last year, Apple was the Number l choice of Chinese students.

    Africa is a very diverse land with many different tribes. One tradition that many of these groups share is painting or marking their bodies and faces in color. They do this for many reasons. Some marks are used to identify people as part of the group. Other marks are used for ceremonies such as wedding and during times of war. Let's look at some different examples of body painting.

    Red is a common color in body painting because it often represents health and long life. Among the Masai of East Africa, when men are old enough to marry and make decisions for their people, they participate in a special ceremony in which they paint their heads and faces red. This ceremony takes place every seven to fourteen years, so there is not an exact age for participating in it.

    The Samburu, also from East Africa, like to paint their faces and hair red because they think it looks pretty.

    The Masai men also have a unique way of showing that they are brave. To show that he has killed a lion, a man will paint his body with a natural white material, making special marks to represent this accomplishment. The Masai men also use this white to show that they are no longer boys and are considered adults.

    One quite unusual example of face painting is done by the Wodaabe people of West Africa. Once a year, they have a beauty contest for men. The men paint their faces yellow and red. Then they add white and black circles and lines. Black paint is used near the eyes and on the lips to draw attention to the whiteness of their eyes and teeth, which the Wodaabe consider most beautiful. The women then decide which man they like best.

    As you travel, enjoy the beautiful and bright colors of Africa.

    There was great excitement on the planet of Venus this week. For the first time Venusian scientists managed to land a satellite on the planet Earth, and it has been sending back signals as well as photographs. The satellite was directed into an area known as Manhattan. Because of excellent weather conditions and extremely strong signals, Venusian scientists were able to get valuable information about the feasibility of a manned flying saucer landing on Earth. A press conference was held at the Venus Institute of Technology. "We have come to the conclusion, based on last weeks satellite landing, "Prof. Zog said, that there is no life on Earth.”

    “How do you know this? "the science reporter of the Venus Evening News asked "For one thing, Earth s surface in the area of Manhattan is composed of solid concrete and nothing can grow there. For another, the atmosphere is filled with carbon monoxide and other deadly gases and nobody could possibly breathe this air and survive. “Are there any other sources of danger that you have discovered in your studies?

    “Take a look at this photo. You see this dark black cloud staying over the surface of Earth? We don' t know what it is made of, but it could give us a lot of trouble and we shall have to make further tests before we send a Venus Being there.”

    “Over here you will notice what seems to be a river, but the satellite findings indicate it is polluted and the water is unfit to drink.”

    “Sir, what are all those tiny black spots on the photographs?

We're not certain. They seem to be metal particles that move along certain paths. They give gases, make noise and keep crashing into each other.

    “Prof. Zog, why are we spending billions and billions of Zilches to land a flying saucer on Earth when there is no life there?"

    “Because if we Venusians can learn to breathe in the Earth atmosphere, then we can live anywhere.”

This summer has brought ex treme heat and droughts to places around the world. The droughts are leading to serious problems and the effects of the droughts are likely to be felt for years. Droughts aren't new, but Earth's rising temperatures because of global warming are making them much harder to avoid. The drought in the Horn of Africa may be the most serious situation. For several years, the area has had very little rain during the rainy seasons. The dry conditions have killed millions of farm animals and destroyed the crops of farmers.

The drought is causing energy problems in Europe, too. The low water levels have cut the amount of hydroelectric power that can be produced. Some rivers are so low that the heavy boats that carry coal can't travel on them.

Farmers in California and Arizona have been hit particularly hard. California has put limits on water use across the state. Now water is being limited in other places. When there are water limits, farmers aren't able to grow as many crops. That can drive up food prices, and that affects everyone.

China is facing similar problems. The drought has dried up much of the water in the Yangtze River. That has cut the amount of energy produced by the world's largest da m by 40%. China hasn't been able to produce enough energy, since millions of people are using electricity to keep cool. The government is calling on the public to turn off the air conditioner when it is not too hot. The country is trying to make it rain by shooting chemicals into clouds. But this is an uncertain and temporary response.

There are no easy solutions to any of these droughts. It took years to create the climate crisis, and it will take a long time to get it under control. For now, governments and people will need to care fully manage water supplies and other resources to limit the damage as much as possible.