Tourism probably started in Roman times. Rich Romans visited friends and family who were working in another part of the Roman empire. But when the empire broke down, this kind of tourism stopped.

    In the early 17th century, the idea of the “Grand Tour” was born. Rich young English people sailed across the English Channel（英吉利海峡）. They visited the most beautiful and important European cities of the time, including Paris in France, and Rome and Venice（威尼斯）in Italy. Their tours lasted for two to four years, and the tourists stayed a few weeks or months in each city. The “Grand Tour” was an important part of young people's education—but only for the rich.

    In the 18th century, tourism began to change. For example, people in the UK started to visit some towns, such as Bath to “take the waters”. They believed that the water there was good for their health. So large and expensive hotels were built in these towns.

    In the 19th century, travel became much more popular and faster. When the first railways were built in the 1820s, it was easier for people to travel between towns, so they started to go for holidays by the sea. And some started to have holidays in the countryside as cities became larger, noisier and dirtier.

    Traveling by sea also became faster and safer when the first steamships were built. People began to travel more to far-away countries.

    The 20th century saw cars become more and more popular among ordinary people. Planes were made larger, so ticket prices dropped and more people used them.

    Thus tourism grew. In 1949, Russian journalist Vladimir Raitz started a company called Horizon Holidays. The company organizes everything—plane tickets, hotel rooms, even food—and tourists pay for it all before they leave home. The package tour and modern tourist industry was born.

    The first travel agency in China was set up as early as 1949. But tourism did not take off until 1978. In 2002, the industry was worth 500 billion Yuan and became an important part of China's social development.

    Changing technology stimulates (刺激) the brain and increases intelligence. But that may only be true if the technology challenges us. In a world run by intelligent machines, our lives could get a lot simpler. Would that make us less intelligent?

    After the Industrial Revolution, machines began to replace manual workers. The process played out in agriculture as well as manufacturing so that groups of agricultural workers were replaced and forced to move to cities to make a living.

    When machines took away much of the manual work, people became less physically active and gained weight. The sedentary (久坐的) lifestyle contributed to a worldwide spreading of overweight and related metabolic disorders such as heart disease, secondary diabetes and kidney disease .

    As our bodies rested, our brains were forced to work harder, however. It is much more difficult to drive through an overcrowded modern city than it is to move around in a small rural village, for instance. Modern jobs are also more complex and urgent and they require more education because employees need to process new information quickly. Even during our leisure time, our brains work harder due to greater availability of books and explosion of audiovisual media, for entertainment, study, music, news, and so forth.

    Now in the Internet age, the amount of information grows fast along with the advance of electronic technologies. The number of people with whom we interact electronically grows by leaps and bounds thanks to the ease of use of social media like Facebook and Twitter.

    All of this extra work for our brains makes us more intelligent. That helps explain why human intelligence increases steadily from generation to generation in all developed countries, a phenomenon named the Flynn Effect. Of course, there are other reasons, including improved nutrition, better medical practices that reduce brain damage, and improved sanitation and public health that reduce diseases of childhood.

    In the P.G Wodehouse novels, Bertie Wooster got away with being a fool because Jeeves was there to back him up with superior brain power. Similarly, people of the future are at risk of being less intelligent because machines will do their thinking for them.

    Artificial intelligence is taking over many human jobs. For instance, planes are being flown much of the time by automatic pilots. Moreover, the complex problem of controlling air traffic around large modern airports is also achieved by artificial intelligence that operates well beyond the capability of mere human air traffic controllers.

    Artificial intelligence exists in many fields of modern life for the simple reason that intelligent machines can already outperform humans, including some aptitudes (天资) which were once thought to be a human advantage, such as playing chess or recalling details in a game of Jeopardy.

    Machine intelligence is increasing much faster than human intelligence. As machines get smarter, they will do more of our thinking for us and make life easier.

    Instead of struggling to identify ourselves to some electronic system via passwords that are secure only if they are hard to remember, the system will work harder to identify us using biometrics (生物测定学) such as fingerprints or even the individual sound of our hearts. More technologies of the future may also be voice-activated so that we will talk with machines much as we would talk to a friend.

    In the future, the electronic assistant will develop to the point where it serves similar functions as a real living chief male servant of a house, fulfilling requests such as: “Organize a dinner party for six on Thursday, Jeeves, and invite the usual guests .”

    At that point, our long struggle with challenging technologies is at an end. Like Bertie Wooster, we can take it easy knowing that the hard work of planning and organizing is being done by a better brain—the electronic assistant. Starved of mental effort, our brains will return to an earlier or less advanced form.

    The future is still in the fog.

    When you go to St. Petersburg, the number of attractions can seem overwhelming. If you're short on time, or just want to make sure to hit the highlights, these are the top must-see sights in St. Petersburg.

    The Hermitage Museum

    The Hermitage Museum is one of the most important sights to see for any visitor to St. Petersburg. There you can see lots of different paintings of old masters inside the Hermitage. Prepare to come face-to-face with classic Western artists.

    The Russian Museum

    The Russian Museum holds one of the largest collections of Russian art in the world. View Russian art creations through the ages, from Byzantine (拜占庭)-style icons to the Socialist Realism of Stalin's times.

    Kizhi Island

    Kizhi Island is an open-air museum of wooden buildings from the Karelia Region of Russia. These impressive structures are made without any nails (钉子) — the wood fits together with joints and grooves (沟槽).

    Peterhof

    Peterhof is as beautiful as it is fun. You'll be charged for admission (门票), but go to Peterhof when the fountains (喷泉) are working — during the day in the summer. They are shut off in winter as well as in the evenings.

    The Church of Our Savior on Spilled Blood

    Love it or hate it, the Church of Our Savior on Spilled Blood is an attractive must-see sight. The beautiful look may make your eyes brighten, and the paintings inside the church will make you say “Wow!”

    The Bronze Horseman Statue

    The Bronze Horseman is a part of Russian Culture and a symbol of St. Petersburg. Made famous by Alexander Pushkin (普希金), this statue of Peter the Great sitting on his horse can truly show Peter the Great's influence on the Russian idea of greatness.

    More and more people like bicycling and it is no surprise. It's fun, healthy and good for the environment. Maybe that's why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no oil cost!

    If you get on a bicycle and ride it, you may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your cars. You can bike to work and benefit from the enjoyable exercise without polluting the environment. You don't even have to ride all the way.

    Folding bikes work well for people who ride the train. Just fold the bike and take it with you. You can do the same on an airplane. A folding bike can be packed in a suitcase. You can also take a common bike with you when you fly. But be sure to look for information by getting on airline websites. Not all airlines are bicycle friendly to travellers.

    Here are some of Health Benefits of Bicycling：

    Bicycling helps to prevent heart diseases.

    Bicycling helps to control your weight.

    A 15­minute bike ride to and from work three times a week burns off five kilos of fat in a year.

    Bicycling can improve your mood.

    Exercise like bicycling has been shown to make people feel better, more relaxed and self-confident.

    Bicycling is healthier than driving.

That night, when Aksionov was lying on his bed and just beginning to sleep, someone came quietly and sat down on his bed. He peered(看) through the darkness and recognized Makar.

"What more do you want of me?" asked Aksionov. "Why have you come here?"

Makar Semyonovich was silent. So Aksionov sat up and said, "What do you want? Go away, or I will call the guard!"

Makar Semyonovich bent close over Aksionov, and whispered, "Ivan Dmitrich forgive me!"

"What for?" asked Aksionov.

"It was I who killed the merchant and hid the knife among your things. I meant to kill you, too, but I heard a noise outside, so I hid the knife in your bag and escaped out of the window."

Aksionov was silent, and didn't know what to say. Makar Semyonovich slid off the bed-shelf and knelt upon the ground. "Ivan Dmitrich" he said, "forgive me! I will confess that it was I who killed the merchant, and you will be released and can go to your home."

"It is easy for you to talk," said Aksionov "but I have suffered for you these twenty-six years. Where could I go now?... My wife is dead, and my children have forgotten me. I have nowhere to go..."

Makar Semyonovich did not rise, but beat his head on the floor. "Ivan Dmitrich, forgive me!" he cried. "When they flogged(鞭打) me with the knot, it was not so hard to bear as it is to see you now... yet you had pity on me and did not tell. Forgive me, devil that I am!" And he began to sob.

When Aksionov heard him sobbing, he too, began to weep. "I will forgive you!" he said. "Maybe I am a hundred times worse than you." And at these words his heart grew light, and the longing for home left him. He no longer had any desire to leave the prison, but only hoped for his last hour to come.

In spite of what Aksionov had said, Makar Semyonovich confessed his guilt. But when the order for his release came, Aksionov was already dead.

Adults check their phones, on average,360 times a day, and spend almost three hours a day on their devices in total. The problem for many of us is that one quick phone-related task leads to a quick check of our emails or social media feeds, and suddenly we've been sucked into endless scrolling.

It's an awful circle. The more useful our phones become, the more we use them. The more we use them, the more we lay neural（神经的） pathways in our brains that lead to pick up our phones for whatever task is at hand-and the more we feel an urge to check our phones even when we don't have to.

What we do know is that the simple distraction of checking a phone or seeing a notification（通知）can have negative consequences. This isn't very surprising; we know that, in general, multitasking does harm to memory and performance. One of the most dangerous examples is phone use while driving. One study found that merely speaking on the phone, not texting, was enough to make drivers slower to react on the road. It's true for everyday tasks that are less high-risk, too. Simply hearing a notification "ding" made participants of another study perform far worse on a task-almost as badly as participants who were speaking or texting on the phone during the task.

It isn't just the use of a phone that has consequences-its me re presence can affect the way we think.

In one recent study, for example, researchers asked participants to either put their phones next to them so they were visible（like on a desk）, nearby and out of sight（like in a bag or pocket）, or in another room. They were found to perform far better when their phones were in another room instead of nearby-whether visible, powered on or not.