The first day of the month of May is known as May Day. It is the time of year when warmer weather begins. People celebrate the coming of summer with customs that are expressions of joy and hope after a long winter. Today, May Day activities have been moved to the May Day holiday on the first Monday of the month. It is a public holiday when families take advantage of the time off to visit some of the UK's many attractions, including parks, zoos, historic buildings, ancient towns and villages and beautiful countryside.

    May Day celebrations have their origins in the Roman festival of Flora, the goddess of fruit and flowers, which marked the beginning of summer. People would decorate their houses and villages with leaves and flowers they picked at daybreak in the belief that the vegetation spirits would bring good luck. In the very early morning, young girls went into the fields and washed their faces with dew (露水). They believed this made them very beautiful for the following year.

    May Day was an important day in the Middle Ages and was a favorite holiday of many English villages. People of the time used to cut down young trees and stick them in the ground in the village to mark the arrival of summer. This is the origin of the maypole (五月柱). People danced around them in celebration of the end of winter. Maypoles were once common all over England and were kept from one year to the next. The tallest maypole is said to have been put up in London on the Strand in 1661. It stood more than 143 feet high and was cut down in 1717, when it was used by Newton to support a new reflecting telescope (反射式望远镜) invented by Dutch scientist Huygens.

    Nowadays, social media like Instagram, Facebook, Snapchat and Twitter are becoming increasingly popular. People have completely made social media part of their daily lives. As a result, many people have developed an Internet personality.

    The Internet personality I am talking about is the one we shape on our social media sites. We are always posting information about ourselves for other people to know even when it can be completely untrue. Some people even go so far as to spend money in buying flowers or “likes” or buying a very expensive camera for their friends to take photos of them. I find it unbelievable. The time and energy spent on these silly things can only make us want to be accepted by more people.

    Social media are also a modem cause of depression: People see the perfect lives of others and consider their own imperfect lives as bad. Even kids deal with this. They don't realize that the reason why they struggle to love themselves is that they spend all day receiving untrue information.

    I find that many people spend more time and energy in making sure that their online personality is worth accepting than caring for their real presence. So many times I have seen confident and beautiful girls on social media. But in the real world, they are extremely shy. They hardly talk to anyone and spend all their time using the phone.

    Social media have gone so far as to even negatively affect marriages. This is because of the fact that there are now “Instagram husbands”—people whose use is to take perfect photos of their partners throughout the day. They spend a lot of time doing that whether they like it or not. Needless to say, social media likely influence relationships in a negative way.

    I think everyone should not use social media at least for a few months to experience the difference it makes to them. They may find life is very different and much better.

    For teenagers, it's great fun to explore new places and it feels like an adventure, even when you know you're not the first to have been there. But to make sure not to get lost or waste time going round in circles, the following tips may be helpful.

    Do the map reading if you're being driven somewhere. It'll be easier if you keep the map following the direction you are traveling in. Keep looking ahead so that you can give the driver lots of warning before having to make a turn, or you'll have to move to the back seat.

    Get a group of friends together and go exploring. You'll need a good map, a compass , a raincoat, a cell phone to call for help in case you get lost, and a bit of spare cash for emergencies .Tell someone where you're going before you set out and let them know what time you expect to be back. The purpose of the activity is in not getting lost, not in seeing how fast you can go, so always stick together, waiting for slower friends to catch up.

    See if your school or a club organizes orienteering（越野识途比赛）activities, in which you need a map and a compass to find your way. This can be done as a sport, with teams trying to find the way from A to B(and B to C, etc. ) in the fastest time, or simply as a spare-time activity. It enables you to be familiar with the use of maps and compass and gain some special skills. In some way, it's not only good fun, but also a great way to keep fit.

    Captain America and Blackpanther were about to defend Earth from the criminal Thanos when Kevin Foley first noticed something was wrong. Foley, a 46-year old information-technology worker from Kyle, Texas, was heading into the theater to see Avengers: Infinity War when he realized he was having trouble breathing normally. The same symptom struck again during another movie the following night, but more severe this time. Once the cast on the second film rolled, Foley took action: he looked at his wristwatch. It was a bigger step than you might imagine, because Foley was wearing an Apple Watch equipped with medical sensors and experimental software to track basic functions of his heart. And the watch was worried. It had, according to the display, detected signs of an irregular heartbeat.

    Before long, Foley was in an emergency room, where doctors hooked him up to an ECG(心电图), which showed that he was in atrial fibrillation(心房颤动), an irregular heartbeat that can lead to blood clots(血栓), stroke and other potentially disastrous diseases. Foley spent the next few days in the hospital while doctors worked to return him to a normal heart rhythm eventually turning to a procedure called electrical cardioversion to shock his heart back to normal. Foley is doing fine now. But he believes that, if not for the warning on his watch, he might not have sought help in time. “I would have never known,” he says.

    Foley and his watch were part of an experiment run by Apple and Stanford's medical school. But beginning Dec. 6, anyone can get an on-the-fly heart checkup, assuming they've paid $399 or more for an Apple Watch. That's when Apple will launch a software update that turns its latest model, called the Series 4, into a personal ECG, thanks to an innovative new sensor. Though less complicated than hospital ECG machines, the watch version can still provide basic information and warnings of potential risks worthy of a closer look by a medical professional.

    For Apple, this new ECG-on-your-wrist is its biggest bet yet that personal technology will inevitably include personal health. Along with competitors, Apple has already offered fitness functions, such as apps to track the steps you've walked. But with the new ECG scan, Apple is moving straight into medical aspects of heath, a distinction underlined by the fact it sought and received Food and Drug Administration clearance for the clearance for the heart monitor.

    Virginia Wildlife is your ticket to learning more about Virginia's spectacular(壮观的）wildlife, fisheries , and breathtaking habitats. Whether you hunt, fish, boat, or take in the wildlife from your easy chair, Virginia Wildlife offers you stories and insight on the natural world, supplied by the state's leading wildlife and outdoor experts.

    Virginia Wildlife magazine has been dedicated to bringing its readers the best in hunting, fishing, boating, and wildlife resource information from around the state. Its award winning design, feature articles, spectacular color photography, and original artwork is an excellent way to explore Virginia's great outdoors.

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    While we all try to find happiness, sometimes we still end up feeling low. While most people can control this feeling, low moods can stay with some, leading to depression. About 322 million people suffered from depression in 2015, according to a report by the World Health Organization in February. This is more than 4 percent of the world's population.

    Depression is described by the WHO as a mental disorder. It has several symptoms including sadness, loss of interest and feelings of low self-worth. In severe cases, depression may even lead to suicide.

    The number of people living with depression is increasing. The WHO reported a rise of 18.4 percent between 2005 and 2015. Young people are a group known to suffer with depression. “The pressures on today's youth are like no other generation, perhaps," Dan Chisholm, an official of WHO, told Reuters.

    In China, depression among young people is on the rise, Zhu Zhuohong, a psychology professor with the Chinese Academy of Sciences, told Xinhua News Agency. Competition to outperform others, especially in education, can cause a lot of pressure for Chinese youth.

    Almost 1.2 million Chinese people aged 15 to 24 suffer from depression, according to a report released by British science journal The Lancet in May.

    Luckily, more and more efforts are being made to deal with this problem. This year's World Health Day, held on April 7, will focus on depression. The day will highlight the “Depression: let's talk" campaign. The campaign aims to make sure that people with depression both seek and get help.