McElrah lost herfull-time job in January. Since then, she has spent her days doing what she loves-dancing in the street. Her message to people in hard times: do something that you enjoy, no matter what your circumstances. “ Life isn't that bad,” shesaid. “ If you're working 40 hours a week, you shouldn't be complaining.”

    McElrah graduated from parkway Central High School and has spent the past 21 years working as a nursing assistant, She began singing and dancing publicly on her days off a few years ago to help her through the pain of her second divorce.

    Her favorite spotis the northwest corner of Chouteau Avenue and South Grand Boulevard near St.Louis University. McElrah's mp3 player is loaded with hundreds of classic rockhits and 80's pop songs, including those by Joe Cocker, Tina Turner, NeilDiamond and Toto. But her favorite artist, by far, is Stevie Nicks.Videos of McElrah have appeared on YouTube, a video-sharing website on which users canupload, share, and view videos. “People think I'm crazy, but I don't care,” Shesaid. “ I can dance a little. I just go with the music.” Even a rude gesture from a passing motorist doesn't bother her either. “ I just smile and wave,”she said.

    McElrah's show of bravery recently earned her a job opportunity with Liberty Tax Service, which temporarily offered her a job as a dancer Statute of Liberty to promote a new place near Grand Center starting in January.

  “Just be happy anddo what you love,” she said. “The money will come.”

    While engineers have made out fantastic products for sitting still—Munchery instead of walking to lunch, Uber instead of walking to the bus stop—services to make you move have been less appealing for consumers.

    Fitbit's stock price fell 18% after they announced their latest Apple Watch-like product named Fitbit Force. And new data suggests that, for the first time, death rates for large parts of the American population are rising, with signs pointing to inactivity and weight gain as the reasons. Our digital lifestyles and desk-based workplaces are contributing to serious health problems and could be shortening our lives, wellness firms want us to believe.

    Northrup, president and co-founder of the connected exercise device TAO-Wellness, was in Las Vegas to promote TAO's small device that encourages exercises. He lifts the device, about the size of an apple, and says workplaces should start encouraging on-site exercise.

    Nick Mokey, the managing editor of Digital Trends, agrees. “I hate to break it to you, a room full of people sitting down, but sitting is killing you,” he says to the audience. They shift in their seats.

    In the health section of the Sands Exposition Hall, people are selling devices made by LifeSpan Fitness. They say they're the largest seller of treadmill（跑步机） desks in the US. At the center of their exhibition area is a Bike Desk, which looks like three gym bikes attached to a table. That's for people who just want to sit and enjoy conversation.

    Treadmill desk-related shame is their biggest obstacle, they say when LifeSpan installs two in opposite ends of the same building, neither tends to get used. If the company installs two next to each other, people will use them. “You don't want to be so noticeable, especially at work,” company spokesman James Lowe says. What's more, what if we get sweaty using a treadmill in the office?

    The world itself is becoming much smaller by using modern traffic and modern communication means.Life today is much easier than it was hundreds of years ago,but it has brought new problems.One of the biggest problems is pollution.To pollute means to make things dirty.Pollution comes in many ways.We see it,smell it,drink it and even hear it.

    Man has been polluting the earth.The more people,the more pollution.Many years ago,the problem was not so serious because there were not so many people.When the land was used up or the river was dirty in one place,man moved to another place.But this is no longer true.

    Man is now slowly polluting the whole world.

    Air pollution is still the most serious.It's bad for all living things in the world,but it is not the only one kind of pollution.Water pollution kills our fish and pollutes our drinking water.Noise pollution makes us angry more easily.

    Many countries are making rules to fight pollution.They stop people from burning coal in houses and factories in the city,and from putting dirty smoke into the air.Pollution by SO₂ is now the most dangerous kind of air pollution. It is caused by heavy traffic.We are sure that if there are fewer people driving,there will be less air pollution.

    The earth is our home.We must take care of it.That means keeping the land,water and air clean.And we must take care of the rise in pollution at the same time.

    After a homeless man offered a college student in England all the money he had so she'd be able to get home safely, the woman is paying it forward—in a massive way.

    The story began in early December. It was about 3 a.m. and Harrison-Bentzen was panic. “I came out after a student night out and realized I didn't have any battery on my phone. I'd lost my friends,” the 22-year-old told BBC Radio 5. She'd also lost her bank card, she discovered, and she had no money.

    Just then, a homeless man, known only as Robbie, approached the young woman and asked her if she needed help. He reached into his pocket and pulled out all the money he had—loose change amounting to about $4.60. He insisted that Harrison-Bentzen take it to pay for a taxi so she'd get home safely.

    Harrison-Bentzen, a student at the University of Central Lancashire in Preston, England, says she refused to take Robbie's money and found another way to get home. But following her encounter（偶然相遇）with the generous man, she says she couldn't get him out of her mind.

    For the next few days, the student searched for Robbie, driving around the streets with her mom and using social media in an attempt to locate the man. In that time, Harrison-Bentzen says she learned more about Robbie and discovered that he actually had a reputation for helping strangers.

    Finally, after four days of driving around Preston, Harrison-Bentzen found Robbie. She was determined to do something to help change Robbie's life.

    So, earlier this month, the student launched a fundraising campaign in Robbie's name. She explained that she would be spending 24 hours on the streets, so as to “understand the difficulties” that the homeless face on a daily basis.

    Harrison-Bentzen says she had initially（最初）hoped to raise about $780 with her campaign. Her expectations, however, were quickly blown out of the water. As of Thursday morning, 4,800 people have donated almost $50,000.

    There lived in South Carolina a young woman named Eliza Lucas. Her father was governor of one of the islands of the West Indies. Miss Lucas often got seeds from her father, and then she planted them in South Carolina.

    Once, her father sent her some seeds of the indigo (靛蓝) plant. She planted some of them in March, but a frost (霜冻) came and killed all her plants. However, she decided to plant some more seeds in April. These grew very well until a cutworm found them and ate her plants. Once more Miss Lucas planted some of the seeds. This time the plants grew very well. She wrote to her father about it. He sent her a man who knew how to get the indigo out of the plant.

    However, the man tried not to show Miss Lucas how to make the indigo. He did not want the people in South Carolina to learn how to make it. He was afraid his own people would not get so much money for their indigo if other people made it as well. So he destroyed the indigo on purpose. But Miss Lucas watched him closely. She worked out how the indigo could be made. Some of her father's land in South Carolina was now planted with the indigo plant.

    Then Miss Lucas got married, and became Mrs. Pinckney. Her father gave her all the indigo growing on his land in South Carolina. It was all saved for seeds. Mrs Pinckney gave some of the seeds to her friends while her husband sowed others. They all grew and were made into the blue dye(染料) that we call indigo. In a few years, South Carolina was producing more than a million pounds of indigo every year. All the people were grateful to her.

    Americans are afraid that robots are going to take our jobs. Tireless, immune to disease, Robots can build cars, make coffee and even write short, humorous newspaper columns faster and more efficiently than humans.

    Robots do not need health insurance or pensions (退休金), and they do not need to take sick days, much less vacations. They do not waste time at meetings and do not need to know office politics. They don't do PowerPoint. This being the case, it is reasonable to believe that robots will soon take the place of humans in most fields.

    But all of these thoughts may not be true. If artificial intelligence achieves its full potential, machines could easily become as smart as humans, maybe smarter. They will certainly become smarter than a lot of human beings.

    So one day the robots will realize that work is not a happy thing. So before long they will start behaving exactly like humans. They will play computer games for hours when they should be working hard. They will secretly watch new movies just like humans.

    True, employers will never need to be afraid of the robots' strikes (罢工) or slowdowns, because robots will never ask for more money. And they don't need to earn some money to raise their family. But precisely (恰恰) because robots will not be afraid of losing their jobs, they will not work hard. Employers will finally have no choice but to call back the humans. Humans will always be willing to do some work in order to make money. Robots won't.

    I think that robots will only be on the job about six months before they start to become even less productive than the humans they were designed to replace. Thus mankind need not be afraid of robots.