Cleaning your plate may not help feed hungry children today, but the timeworn advice of mothers everywhere may help reduce food waste from the farm to the fork, help the environment and make it easier to feed the world's growing population.

    Hard data still being collected, but experts in Chicago said about 30% to 50% of the food produced in the world goes uneaten. The average American throws away 33 pounds of food each month—about $40 worth, which means each person throws away almost 400 pounds of food. The US Department of Agriculture says that 23% of eggs and an even higher percentage of produce ends up in the trash.

"We forget we have all these fresh fruits and vegetables, and at the end of the week we have to throw them away", said Esther Gove, a mother of three young children in South Berwick, Maine. "Now, I don't buy as much fresh produce as I used to."

    But the effect of food waste arrives far beyond the kitchen. Agriculture is the world's largest user of water, a big consumer of energy and major emitter of greenhouse gases during production. Experts say reducing waste is a simple way to cut stress on the environment and can ease pressure on farmers, who will be called on to feed an expected 9 billion people around the world in 2050, compared with nearly 7 billion today.

    No matter how sustainable (可持续的) farming is, if the food's not getting eaten, it's not sustainable and it's not a good use of our resources. In richer nations, fruit and vegetables end up in the trash because they aren't pretty enough to meet companies' standards, have gone bad in a home refrigerator or aren't eaten at a restaurant. In developing countries, much food spoils before it gets to market due to poor roads and lack of refrigeration. High food prices are another reason, since some people can't afford the food that's produced.

    The National Gallery

    Description:

    The National Gallery is the British national art museum built on the north side of Trafalgar in London. It houses a diverse collection of more than 2,300 examples of European art ranging from 13th-century religious paintings to more modern ones by Renoir and Van Gogh. The older collections of the gallery are reached through the main entrance while the more modern works in the East Wing are most easily reached from Trafalgar Square by a ground floor entrance.

    Layout:

    The modern Sainsbury Wing on the western side of the building houses 13th-to15th-century paintings, and artists include Duccio, Uccello, Van Eyck, Lippi, Mantegna, Botticelli and Memling.

    The main West Wing houses 16th-century paintings and artists include Leonardo da Vinci, Cranach, Michelangelo, Raphael, Bruegel, Bronzino, Titian and Veronese.

    The North Wing houses 17th-century paintings and artists include Caravaggio, Rubens, Poussin, Van Dyck, Velazquez, Claude and Vermeer.

    The East Wing houses 18th-to early 20th-century paintings, and artists include Canaletto, Goya, Turner, Constable, Renoir and Van Gogh.

    Opening Hours:

    The Gallery is open every day from 10am to 6pm（Fridays 10am to 9pm）and is free, but charges apply to some special exhibitions.

    Getting There:

    Nearest underground stations: Charing Cross (2-minute walk). Leicester Square (3-minute walk), Embankment (7-minute walk), and Piccadilly Circus (8-minute walk).

    Being sociable looks like a good way to add years to your life. Relationships with family, friends, neighbours, even pets, will all do the trick, but the biggest longevity(长寿) boost seems to come from marriage or an equivalent relationship. The effect was first noted in 1858 by William Farr, who wrote that widows and widowers(鳏夫) were at a much higher risk of dying than their married peers. Studies since then suggest that marriage could add as much as seven years to a man's life and two to a woman's. The effect holds for all causes of death, whether illness, accident or self-harm.

    Even if the odds are stacked against you (the conditions are not favourable), marriage can more than compensate. Linda Waite of the University of Chicago has found that a married older man with heart disease can expect to live nearly four years longer than an unmarried man with a healthy heart. Likewise, a married man who smokes more than a pack a day is likely to live as long as a divorced man who doesn't smoke. There's a flip side, however, as partners are more likely to become ill or die in the couple of years following their spouse's death, and caring for a spouse with mental disorder can leave you with some of the same severe problems. Even so, the odds favour marriage. In a 30-year study of more than 10,000 people, Nicholas Christakis of Harvard Medical School describes how all kinds of social networks have similar effects.

    So how does it work? The effects are complex, affected by socio-economic factors, health-service provision, emotional support and other more physiological mechanisms(机制). For example, social contact can boost development of the brain and immune system, leading to better health and less chance of depression later in life. People in supportive relationships may handle stress better. Then there are the psychological benefits of a supportive partner.

    A life partner, children and good friends are all recommended if you aim to live to 100.The best social network is still being mapped out, but Christakis says: “People are interconnected, so their health is interconnected.”

    At times my mom has been uncomfortable seeing these qualities in me. For example, when I was 12, I went to Puerto Rico all by myself to stay with my grandmother for the summer. My mom was extremely nervous about it. She kept telling me how things were different in Puerto Rico, to always put on sunscreen， not to wander away from my grandmother, and other warnings. She helped me pack and did not leave the airport until she saw my plane take off.

    But despite her worries, she let me go on my own. As I moved into my teens, she continued to give me space to grow and learn, even when it might have been difficult for her. When I reached my senior year, I decided to move away for college. Once again I found that I differed from my peers. While many of them wanted to stay close to home, I couldn't wait to be out in the world on my own. While my mom may not have been happy at the thought of my going away, she was supportive and excited for me.

    One big thing I realized during my senior year, as my mom granted me more freedom, was that she actually believes in me and trusts me. That means a lot. Most of my life, and especially when I was little, the main person I tried to impress in my schoolwork or other things was my mother. I knew she expected nothing but the best from me. Sometimes it was hard to live up to her standards: getting a single B on my report card would make me feel bad because I knew she wanted me to have all As.

    I know that her high standards have helped me stay focused on what's important, like education, and made me who I am. I am thankful for her support and involvement in my life. Most of all I respect her. She is the strongest woman I know and that's why I have turned out so strong and independent.

    Director James Cameron went to new depths for his film-making on Sunday by setting the world record for the deepest ocean dive by a single person.

    This type of extreme research is nothing new to the director. Cameron, 57, is most famous for directing Titanic (1997) and Avantar (2009). During the several years of research for Titanic, he famously traveled to the bottom of the ocean to visit the sunken ship. He also visited the deep sea as research for his fictional 1989 film. The Abyss, which is about a submarine that comes across an alien species. "Most people know me as a film-maker," Cameron said. "But the idea of exploring the ocean has always been the stronger drive in my life."

    Cameron and his team had been preparing for the trip for seven years. On Sunday, Cameron took more than two and a half hours to make the dangerous 6.8-mile journey down to the Trench, an area with near-freezing temperatures, no sunlight, and heavy water pressure. Cameron traveled in a 24-foot-long mini-submarine he helped design, equipped with lights and 3D cameras for filming the adventure. It also had a mechanical arm for collecting samples of soil and deep-sea creatures. Humans had not visited the Mariana Trench since two divers first reached the deep-sea spot in 1960. The divers Don Walsh and Swiss oceanographer Jacques Piccard spent 20 minutes there but could hardly see anything. They took no pictures.

    In his well-equipped submarine, Cameron was able to spend three hours in the Trench, exploring and filming. He plans to use his recordings in a 3D film production for movie theaters and for a National Geographic TV special. "I see this as the beginning," Cameron said. "It's not a one-time deal. This is just the beginning of opening up this new frontier."

At just 18 years old, Khalifa Aminu from Kano, Nigeria, has proved himself as an amazing inventor, with his sensory glasses designed to help the visually impaired (视障人士).

The glasses are fitted with infrared sensors (红外传感器) that can "see" obstacles in the user's path, warning them about possible dangers without the need for traditional walking sticks or guide dogs. In their current form, the glasses let out a beeping sound when an object is nearby, helping users move past it safely. Aminu is now working on making the glasses even more effective, particularly in low-light and nighttime conditions.

Aminu's journey into the world of invention began in childhood. He started small, building a canoe (独木舟) as his first project, and quickly realized that his creations could be used to solve real-world problems in his community. This love for invention has led him to create various innovations such as a radio station, a bomb detector and an automatic water sprayer for farmers.

As for how Aminu came up with the idea of his latest creation, Aminu explained, "I grew up in an area where there are visually impaired people, and I understand what they're going through. This is why I began the process for a technology-based solution for them."

The glasses have received positive feedback from testing. In a recent trial, a blind man was highly impressed by their effectiveness. "He suggested several improvements, like a wireless switch, smaller parts, and lenses for better usability," Aminu explained. "These suggestions will be carried out in future versions, but the challenge remains the lack of materials and resources for further development."

Luckily, in June, Aminu's invention caught the attention of Nigeria's National Commission for Persons with Disabilities, suggesting a bright future for him in further innovation and mass production. "My ultimate dream is to build a global company that continues to develop innovative technological solutions not only for Nigeria but for the world," said Aminu.