Here is an astonishing and significant fact: Mental work alone can't make us tired. It sounds absurd. But a few years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue(疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer, we would find it full of fatigue toxins(毒素)and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

    So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours of effort as at the beginning. The brain is totally tireless. So what makes us tired?

    Some scientists declare that most of our fatigue comes from our mental and emotional(情感的)attitudes. One of England's most outstanding scientists, J. A. Hadfield, says, "The greater part of the fatigue from which we suffer is of mental origin. In fact, fatigue of purely physical origin is rare. "Dr. Brill, a famous American scientist, goes even further. He declares, "One hundred percent of the fatigue of a sitting worker in good health is due to emotional problems. "

    What kinds of emotions make sitting workers tired? Joy? Satisfaction? No! A feeling of being bored, anger, anxiety, tenseness, worry, a feeling of not being appreciated—those are the emotions that tire sitting workers. Hard work by itself seldom causes fatigue. We get tired because our emotions produce nervousness in the body.

    Imagine possessing something that you loved so much. Imagine what it would feel like if you lost it. While that item may be something as simple as a doll, you would still feel very upset, but you could replace it with a new one. Now imagine losing something that you depend on for survival and cannot be replaced. That is what it would be like if we lost the natural environment around us.

    Firstly, I believe the environment should be preserved because it supports human life. One of the largest examples is that we get all of our food and drinks from the environment. If the environment were to be destroyed beyond revival, then the human race would be over in months. Scientists have yet to find another planet with similar conditions to the Earth, and if it's found, we don't have the technology to get to that planet on time.

    Secondly, I believe that the environment serves as an amazing educational tool for students. When I was in second grade, I had an absolute interest in animals. When we had a field trip to the Daggerwing Nature Center, I was very excited. When we got there, I could hardly believe what I was seeing. There was a bridge to get to the main building, and under the bridge was a small swamp (沼泽) with turtles, fish, and my personal favorite, alligators. I was so surprised that I almost ran into the tour guide. We walked into the building and saw various animals in their habitats. I was so inspired by this visit. Six years later, I have taken an animal behavior class for three weeks. Meeting by chance with the environment can inspire people, and if preserved it will continue to inspire people.

    In conclusion, the environment is so valuable because it can't be replaced, keeps us alive, and serves as a great educational tool.

    Here are some must-know festivals from a handbook which you cannot miss in some Asia countries.

    Singapore Night Festival

    Aug. 17-25 The annual Singapore Night Festival is a celebration of the island nation's arts and cultural heritage (遗产). A highlight of the festival is the interactive light show that transforms the front of surrounding buildings into artistic wonders. http://www.nightfestival.com

    Royal Floria

    Aug. 25-Sep. 2 This year's event marks the 10th anniversary of the Royal Floria in Putrajaya, with more than 400,000 floral displays. Floral designers and landscape architects from 10 countries are set to show their talent with their arts and cultural creations. http://www.floriaputrajaya.com

    Tet Trung Nguyen

    Aug. 25 It is believed that during Tet Trung Nguyen (Ghost Festival), spirits of the dead return home in search of their loved ones. Vietnamese pay homage(敬意) to their ancestors during the festivals by preparing feasts as prayer offerings. http://www.vietnamtourism.com

    George Town Festival

    Aug. 4-Sep. 2 The George Town Festival was inaugurated(创立) in 2010 in conjunction with the city's designation as a UNESCO World Heritage site. It has become one of the region's important cultural festivals, showing myriad events that include musical performances, art exhibitions and film screenings taking place across multiple venues. http://www.georgetownfestival.com

    If American waterways had ever been voted on the yearbook, the Buffalo River could easily have been named Ugliest. It could be hard to find hope there. It took decades for public perception of the river to shift. But activist citizens, who collaborated with industry, government, and environment groups never gave up on their polluted river—the Buffalo River gradually went from being considered a lost cause to a place worth fighting for. And by now the cleaned—up water is one of Buffalo'S biggest attractions.

    By the 1960s, the river was seen as one of the worst sources of pollution pouring into the Great Lakes. The Buffalo River had caught fire many times. The surface had an oily layer, and any fish caught there were not eatable.

    The waterway's fate started shifting in the mid-1960s. Stanley Spisiak was a local Polish—American jeweler by day, but by evening he was the kind of guy who'd chase down dumpers(垃圾车)he spotted on the Buffalo River. By 1966 he found himself winning the National Wildlife Federation's "Water Conservationist of the Year" award. And before long he got a nickname:" Mr. Buffalo River. "But there was only so much he could do—the river was still declared biologically dead in 1969.

    Jill Spisiak Jedlicka is his great-grandniece. She picks up where he left off by directing the river's protector organization, Buffalo Niagara Waterkeeper. Professor Schneekloth and seven friends founded the organization as an all-volunteer nonprofit in 1989, after organizing the first river cleanup that year. Today the group employs 27 full-time workers and has helped oversee the Buffalo River's $100 million restoration.

    So far, the Buffalo River's water quality has restored, but it is still an ongoing issue, as sewage(污水)can overflow into the river after storms. Habitat restoration continues as well; fish and plantings are still being sampled to measure how well it's gone.

After years of travel it was bound to happen. Waiting by the moving belt, I watched the suitcases make mocking(嘲弄的) rounds. My companions, exhausted after16hours in the plane, were sympathetic and relieved. They were all thinking: at least it wasn't me. Any moment now, I told myself, swearing at the happy vacationers busy collecting their things. What about my necessities (必需品)?

For millions of travelers a year, it happens. Their missing bags stolen, sold in blind auctions(拍卖), or gone forever without any explanation. Today it was my turn, in a crowded Indian airport, as far from home as I'd ever been.

So, while the airline hunted for my belongings with no any order or plan and asked whether I would rather have $200– I found myself wandering the hot streets of Delhi in an orange dress and a pair of blister-producing ballet flats. Equipped with my carry-on (contents: eyeglasses, a paperback, an ancient tube of Chapstick), I was forced to "manage".

Day two, good news. The bag had been found! Bad news: it is still sitting in Toronto. Did it miss me as much as I missed it?

But then, a twist. I survived. By day three, I was secretly enjoying myself. What to wear? Hello, orange. Make-up today? Not an option. With almost nothing, I found better things: a new understanding of necessity, a short break from my obsession(痴迷) with stuff, stuff and more stuff, and a new appreciation for what does matter (the Taj Mahal) , when my bag finally made its way back to me.

That's right, my jam-packed blue suitcase resurfaced – on day four – and I suddenly had a rainbow of ten dresses to choose from. I decided to wear my orange dress once more, for good luck. It worked: nothing went missing on my journey home.

Four Best Shows for Toddlers (学步的孩童)

Peppa Pig

If you're looking for a British TV show for toddlers, look no further than Peppa Pig. This charming series will have your little one love Peppa and her family as they start their adventures through life in a colorful world.

Each episode of Peppa Pig is like a colorful storybook, combining five parts into 25 minutes of pure joy. Not only is it entertaining, but it also teaches essential social skills, such as kindness, loyalty, and thoughtfulness, making it an ideal choice for young kids and preschoolers.

Sesame Street

If you have fond memories of watching Sesame Street back in the day, why not pass on some of that magic to your little one? The show now is in its 54th season, which is the longest running program of the four shows, and the whole group is still bringing the fun. Not only is the 30-minute program still a crash course in all things smart, with numbers and words on the menu, but there's also wonderful music.

Daniel Tiger's Neighborhood

Step into the interesting world of Daniel Tiger, the lovable star of this show that's a popular offshoot (分支) of the timeless Mr. Roger's Neighborhood. With a runtime of 30 minutes, this show offers plenty of learning opportunities through engaging stories and catchy musical numbers.

Curious George

If you have fond memories of your parents reading Curious George books, you're in for a treat! The beloved stories were transformed into a charming lively series on PBS in 2006, ideal for toddlers. Each episode clocks in at a solid 30 minutes, and it's all about encouraging kids to be as curious and eager to explore as George himself.