Dujiangyan is the oldest man-made water system in the world, and a wonder in the development of Chinese science. Built over 2,200 years ago in what is now Sichuan Province in Southwest China, this amazing engineering achievement is still used today to irrigate over 6,000 square kilometres of farmland, take away floodwater and provide water for 50 cities in the province.

    In ancient times, the region in which Dujiangyan now stands suffered from regular floods caused by overflow from the Minjiang River. To help the victims of the flooding, Li Bing, the region governor, together with his son, decided to find a solution. They studied the problem and discovered that the river most often overflowed when winter snow at the top of the nearby Mount Yulei began to melt as the weather warmed.

    The simplest fix was to build a dam, but this would have ruined the Minjiang River. So instead Li designed a series of channels built at different levels along Mount Yulei that would take away the floodwater while leaving the river flowing naturally. Better still, the extra water could be directed to the dry Chengdu Plain, making it suitable for farming.

    Cutting the channels through the hard rock of Mount Yulei was a remarkable accomplishment as it was done long before the invention gunpowder and explosives. Li Bing found another solution. He used a combination of fire and water to heat and cool the rocks until they cracked and could be removed. After eight years of work, the 20-metre-wide canals had been carved through the mountain.

    Once the system was finished, no more floods occurred and the people were able to live peacefully and affluently. Today, Dujiangyan is admired by scientists from around the world because of one feature. Unlike modern dams where the water is blocked with a huge wall, Dujiangyan still lets water flow through the Minjiang River naturally, enabling ecosystems and fish populations to exist in harmony.

    My husband and I are saving thousands of dollars every year by growing our own vegetables in our backyard. We learn something new every year and this website has been made to share tips with other people that would like to grow some of their own food.

    It's true that if you are starting from fresh, it will cost a little bit of money to get started. However, once everything is set up, the cost is very small and the rewards are huge. The size of your family and how many vegetables you eat determine exactly how much money you can save every year. We do a lot of juicing, so we are saving thousands of dollars by growing some carefully selected greens.

    There is an amazing sense of accomplishment when you grow your own vegetables. Vegetables out of your vegetable garden don't get any fresher, tastier or more satisfying. The whole family can get involved in this hobby and kids will learn where food comes from and appreciate nature even more.

    Our approach to vegetable gardening is completely different from the normal one. We are doing it in the lazy way with zero digging and fertilizing(施肥). The way we grow our vegetables is to emulate natural ecosystems. No rows of carrots can be found in our garden beds. Rain forests seem to do just fine without human interference(干预) or having plants sown in rows, so we have applied the same principle to our vegetable garden and we care producing more vegetables than ever.

    By copying nature we spend little time working in the vegetable garden but get a much better crop than previous years when we followed the rules. What can I say? We're such rebels.(叛逆者）

    When we talk about Americans barely into adulthood who are saddled with(担负着) unbearable levels of debt' the conversation is almost always about student loan debt. But there's a growing body of evidence suggesting that today's young adults are also drowning in credit-card debt and that many of them will take this debt to their graves（坟墓）.

    More than 20% overspent their income by more than $ 100 every single month. Since they haven't built up their credit histories yet, it's a safe bet that these young adults are paying relatively high interest rates on the resulting credit card debt.

    Although many young people blame "socializing" as a barrier to saving money, most of them aren't purchasing $ 20 drinks in trendy bars. They're struggling with much more daily financial demands.

    To a disturbingly large extent, the young and the broke are relying on credit cards to make it until their next payday. This obviously isn't permanent in the long run, and it's going to put a huge drag on their spending power even after they reach their peak earning years, because they'll still be paying interest on that bottle of orange juice or box of spaghetti (意式面条）they bought a decade earlier.

    A new study out of Ohio State University found that young adults are accumulating credit card debt at a more rapid rate than other age groups, and that they're slower at paying it off. "If what we found continues to hold true, we may have more elderly people with substantial financial problems in the future'" warns Lucia Dunn, professor of economics at Ohio State. "If our findings persist, we may be faced with a financial crisis among elderly people who can't pay off their credit cards."

    Dunn says a lot of these young people are never going to get out from under their credit card debt. "Many people are borrowing on credit cards so heavily that payoff rates at these levels are not plenty to recover their credit card debt by the end of their life which could have loss impacts for the credit card issuing banks,"

    Plants are living things. So can they feel pain? Plants don't feel pain the same way animals and people do, says Anke Steppuhn. She is a scientist at the Free University of Berlin in Germany. "What we define as pain usually has to do with a nervous system," Steppuhn explains. When you put your hand too close to a hot stove, nerve cells send a signal to your brain. Your brain decodes (解码) that signal as pain. This causes you to pull your hand away before any serious damage is done.

    Plants don't have nerves or brains, so they can't feel pain like we do. "But plants do recognize when something is hurting them," Steppuhn says. Because they are rooted to the ground, they can't escape a dangerous situation. So they need other ways of fighting back.

    The biggest threat to a plant's life is getting eaten. Some plants grow sharp little hairs. Other plants produce bad-tasting or even harmful chemicals. These force an attacker to abandon its meal. A plant called bittersweet nightshade does something even smarter, Steppuhn found. When a slug (蛞蝓) chews holes in a nightshade' s leaf, liquid begins dripping (滴) around the wound. It is almost as if the plant were bleeding. The liquid is sugary nectar (花蜜), and it happens to be a favorite food of ants. In their effort to collect the nectar, the ants swarm (蜂拥而至) all over the injured plant. They will attack anything that stands in their way. That includes the slug that damaged the plant in the first place. It's a very clever trick. Whenever a slug attacks a plant, the plant calls an army of ants to kill the slug.

    Nectar isn't the only way plants attract bodyguards. They also release certain chemicals into the air when they are being eaten. People usually can't detect these smells. But wasps (黄蜂) can. When a wasp detects this cry for help, it races to the scene of the crime. If it finds the right kind of insect chewing down on the plant, the wasp will interrupt the attacker's meal. It will do this by laying eggs inside the insect's body!

    "When your mother scolds you, you can look elsewhere and think about other things. Just ignore her words. But remember: such a tough attitude cannot be used often." These words are from a series of cartoons which outline skills for children to fight against their mothers. The images have created heated debate among Chinese netizens (网民).

    Regarded as "a book for children aged 6 to 12 who are always scolded by their parents", the cartoons, drawn by two 10-year-old Beijing girls, list over 20 skills which children can use to deal with their mothers' anger such as crying, pretending to be ashamed, fleeing into the toilet and pleasing her afterwards. Each skill is described with vivid pictures and humorous notes. The creativity of the young girls has amazed netizens, the Yangtse Evening Post reported on Thursday.

    According to one of the girls' mothers, her daughter once received a poor mark in an exam, and the mother blamed her and compared her performance with another classmate. The daughter's feelings led to her creating the cartoons. The girl's father, who first posted the pictures on his Sohu Microblog on Monday, said he hopes parents pay close attention to the pictures, allow children to feel free to develop their own characteristics and try not to criticize them so often.

    "The cartoons, although an individual case, reflect a modern phenomenon and some of the problems within Chinese family education," said Yu Qinfang, an expert on family education. According to a survey of 104 children and their parents, Yu discovered that as many as 51.9 percent of primary school students hate being urged to do things by their mothers. "Not giving children enough time and hurrying them to do things seems to be a very tiny detail within family life, but it is potentially a huge problem which can easily be ignored by parents. A mother's blame may lead to negative feelings within her child's heart," Yu said. "Parents should learn to blame less and be more patient."

When faced with the decision to get out of bed or have a few more minutes of sleep, which do you choose? Believe it or not, that decision could make a world of difference in the rest of your day.

About 85 percent of Americans use an alarm clock to wake up in the mornings, according to sleep researcher Till Roennenber. And while there are no official numbers on snoozing (打盹), a quick survey of social media makes it clear that hitting the snooze button is a popular pastime.

As to how the snooze button will affect your day, scientists have mixed opinions. Some scientists think people who hit the snooze button in the mornings are actually clever, creative and happy while some said that hitting the snooze button will ruin your life, or at the very least your day. "I feel that hitting the snooze button has got to be one of the worst things that ever happened to human sleep," researcher Jonathan Horowitz said. "The chances of you 'snoozing' and actually experiencing a meaningful rest are close to zero."

According to some sleep experts, when hitting the snooze button, you are in fact confusing your body and mind, and throwing yourself into a deep state of being sleepy. The body needs some time to wake up, so, when returning to what will be a light sleep for a brief period of time, you are putting your body back into a sleep mode before waking it again. At that point your body won't know what it wants, resulting in a sort of half awaken state.

If you really want to take advantage of an alarm clock, the key is to form a healthy sleep cycle. Focus your efforts on getting enough sleep each night and waking up at the same time each day so that when your alarm goes off you feel rested.