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.

    Tiny as they are, bats have the ability to “see” in the dark by using a special skill called echolocation(回声定位法). They make noises and wait for sound waves, or an echo, to bounce(反弹) back off objects. They can tell the distance of various objects by how quickly the sound waves bounce back off them. If no sound bounces back, they can then fly forward.

    This special ability has been simulated in the human world for a long time, such as in submarines and planes, whose sonar(声呐) systems are somewhat similar to echolocation. But apart from helping vehicles “see” where they are, what if blind people could use echolocation for themselves? It turns out, some already are.

    American Daniel Kish, who is blind, is known as “Batman”. This isn't because he walks around in a cape and a mask, but because he has a bat-like ability to locate where he is through sharp clicks he makes by moving his tongue against the roof of his mouth. Kish is so skilled at echolocating that he can ride a bike and hike on his own.

    Recently, research carried out at the University of Durham in England shed some light on the power of human echolocation.

    Kish worked with a group of scientists who studied the way blind people listen to the echoes that they produce from clicks.

    The team, which conducted experiments with other volunteers, found that people were capable of hearing even very faint echoes, ones far fainter than had been previously thought.

    Speaking to The Independent, Lore Thaler, lead scientist of the group, said, “We found that in some conditions, they were really faint – about 95 percent softer than the actual clicks, but the echolocators were still able to sense this.”

    Andrew Kolarik of the University of Cambridge is another expert in echolocation. Reacting to the Durham study, he told BBC News that echolocation “can be very useful at providing information at face or chest height” and could help people “avoid objects like low hanging branches that might not get detected by the cane or a guide dog”.

    Although Kish's skill is remarkable, there's hope for other blind people who want to use echolocation. According to BBC News, echolocation is a skill blind people can acquire and develop, just like learning a language. As Kolarik said: “Teaching echolocation skills could provide blind people with the means of exploring new places.”

    Panama City, Panama

    For beach vacations that get you out of town and invite you and your family to dive into culture, consider a trip to Panama City. Here, you will enjoy beaches and city exploring. Book your stay at the Westin Playa Bonita, where you can book a room starting at $222 a night. There are various programs, including beach Olympics, stargazing (天体观察）and Spanish lessons.

    Jupiter, Florida

    This place offers you quality time you can spend with your loved ones. Book your stay at Jupiter Beach Resort & Spa, with rates for a family of four starting at $207 a night. Here, you can shoot baskets at the basketball courts, take a dip in the pool or teach your children beach yoga.

    San Diego, California

    The West Coast is a great spot for cheap beach vacations, so tell your family to pack their bags for a visit to San Diego. A cheap $10 Uber ride from the airport will have you pulling up the Kona Kai Resort & Spa. Here, a family of four can stay in a Deluxe Guest Room starting at $159 per night. Your kids can practice cannonballs at the pool after a visit to the world-famous San Diego Zoo.

    Kihei Maui, Hawaii

    For West Coasters who are growing bored with their backyard, fly to the islands of Hawaii. Stay at the Aston at the Maui Banyan, with a charge of $179 a night for a family of four. Here, you'll witness some of the best sunsets of your life while your kids splash (戏水）in the Pacific, And if you're set on cooking a fancy meal, you'll enjoy suites that come with a full kitchen.

    Dodder is an unusual and unwanted plant that attacked other plants. Except for its flower, the plant looks like spaghetti, a kind of noodles in the shape of long thin pieces that look like string when they are cooked. It's almost leafless, thread-like stems hang down on top of other plants that dodder needs to stay alive. Dodder does not produce its own food. Instead, it steals food from other plants. It feeds by sucking juices from the plant which is wrapped around, often making its host very weak or even killing it.

    Dodder can find other plants by their smell. When a young dodder plant starts growing, it follows the smell of plants it prefers, like tomato plants, potato plants, or other farm crops. Unlike most plants that usually grow in the direction of light or warmth, a dodder plant will grow in the direction of, for example, tomato smell-if a tomato happens to be growing nearby.

    However, a young dodder plant must find a host plant quickly. It no longer needs its root once it is attached to the host and wrapped around it. If it cannot catch a smell of potential host within a few days, it will dry up and vanish even if there is plenty of water around. Once it finds a host, the young dodder plant will attach itself to it and start growing faster. At that point the dodder plant will drop its root.

    Dodder is thus a difficult weed to manage and a real headache for farmers. When it does get out of hand, dodder can greatly reduce a farmer's harvest or even destroy crops completely. Before sowing their produce, especially farmers in warm parts of the world often check to make sure no unwanted dodder seeds have mixed with their crop seeds. This is a good way to stop dodder plants from making their way to a crop field secretly.

    Marathon fever is sweeping this country. In recent years, China's ever-growing passion for marathons has been triggered by its economic development and health-conscious middle class. A large number of marathon runners are white-collar workers, civil servants and business people that are keen on leading a healthy lifestyle. Government support, social participation and strong marketing by the sports industry have gradually led to the rapid development of the marathon industry, which is currently valued at 70 billion yuan ($10. 77 billion). Due to its large participation and nationwide media report, marathons are considered by local governments an important part of marketing their cities. Thus, many cities list unique routes across local scenic spots and historical attractions, not only to boost people's fitness, but also to promote local tourism.

    For many runners, marathons are a way of life." As we get older, the places and opportunities to meet new people decrease. I find that participating in marathons is a simple way to make friends," said Wu, who made many friends in the Xstop Running Community, a running club with 48, 000 members established by Xtep, one of the leading distributors of sports merchandise in China.

    "The sense of belonging and the mutual encouragement that exists within the running community are very attractive to many people. We easily befriend one another, since we have the same goal: to keep running and never stop," Wu said. Besides, a marathon can be a great way to explore new places. For a runner who also loves traveling, marathons are a solid choice. "Competing in an international marathon is a chance to experience a city or a country you've never visited before," said Meng, an experienced runner from north China's Tianjin Municipality, who often runs in London, New York and Melbourne.

    There's a unique perspective that people get running through the streets of a city, distinct ancient buildings or amazing natural settings, he explained, things that somehow just can't be seen by rushing in a car. In addition, during a race, streets are often closed off so you don't have to battle traffic.

    "What kind of rubbish are you?" This question might normally cause anger, but in Shanghai it has brought about complaints over the past week. On July 1st, the city introduced strict trash-sorting regulations that are expected to be used as a model for our country. Residents must divide their waste into four separate kinds and put it into specific public bins. They must do so at scheduled times, when monitors are present to ensure compliance（服从）and to inquire into the nature of one's rubbish.

    Violators face the possibility of fines and worse. They could be hit with fines of up to 200 yuan ($29). For repeat violators, the city can add black marks to their credit records, making it harder for them to obtain bank loans or even buy train tickets.

    Shanghai authorities are responding to an obvious environmental problem. It generates 9 million tonnes of garbage a year, more than London's annual output and rising quickly. But like other cities in China, it lacks a recycling system. Instead, it has relied on trash pickers to sort out the waste, picking out whatever can be reused. This has limits. As people get wealthier, fewer of them want to do such dirty work. The waste, meanwhile, just keeps piling up. China produces 80 billion pairs of disposable(一次性的)chopsticks a year.

    Many residents appear to support the idea of recycling in general but are frustrated by the details. Rubbish must be divided according to whether it is food, recyclable, dry or hazardous(有害的), the differences among which can be confusing, though there are apps to help work it out. Some have complained about the rules surrounding food waste. They must put it straight in the required public bin, forcing them to tear open plastic bags and toss it by hand. Most upset are the short windows for throwing trash, typically a couple of hours, morning and evening. Along with the monitors at the bins, this means that people go at around the same time and can keep an eye on what is being thrown out; no one wants to look bad.