Research shows that isolation(隔绝，孤立)is bad for us and associated with certain diseases including depression, high blood pressure and heart disease. Yet teenagers seek isolation by using the device of our times—a screen, screens of all kinds. However, in whatever form, screens are addictive, and addictive from an early age. Research has shown that given the chance, six-month-old babies prefer screens to real human faces.

    Hand in hand with this addiction to screens, we are seeing an explosion of teenage mental health problems. Social media claims to be inclusive, keeping you connected. But it's not. It isolates you from real people. Screens have even been described as being poisonous for teenagers.

    Psychologist Jean Twenge, a professor at San Diego State University, believes today's teenagers are “on the edge” of a major mental health crisis and requestes, “do anything that doesn't involve a screen”. The problem is, she claims, children born between 1995 and 2012 have grown up with a smart phone in their hands, and it has “changed every aspect” of their lives. The number of teenagers who actually see their friends frequently has dropped by more than 40% since 2000. In 2015, only 56% of 17-year-old went on a date, down from 85%. Modern teenagers are slower to learn to drive, or earn money and spend more time at home. They're “on their phone, in their room, alone and often depressed”, she says.

    Some critics, however, say we should encourage our children to spend more time online. Robert Hannigan, former director of GCHQ, said in August that Britain is badly short of engineers and computer scientists, and urged children to develop cyber skill to compete in the digital economy.

    I' m not the first to say that social media is inferior to real human contact, and harms mental health. Studies show teens who spend three hours a day online are 35% more likely to suicide(自杀).

    The suicide rate among girls aged 12 to 14 has more than doubled in a decade.

    When you're on the go, your best friend and resource can be your phone. In the age of smart phones, apps are like guiding stars: They can point you in the right direction for a hotel, list expenses, send postcards, and much more. When used together, these apps can be the basic travel tool, placing a wealth of information at your fingertips no matter where you are on the planet. U.S. NewsTravel has picked the essential travel apps, known for their utility and reliability. Best of all, they cost absolutely nothing.

Trip It

    Your Personal Travel Agent

    Be your own travel agent and plan every detail of your trip—from car rental to accommodating restaurants—with Trip It. You can make travel schedule by hand, or simply forward the email confirmations of your flight, rental car, train tickets, and hotels to plans.

Weather Free

    Your Go-To Meteorologist(气象学者)

    Stop trying to explain the weather forecast on the evening news (particularly when it's in a foreign language). The Weather Free app informs you (in English) of the climate in various locations. It features the local weather, and other key factors that will inform your decision about what to wear before stepping outside.

Goby

    Your Event Guru

    When you're in a foreign city, you sometimes look around and ask: Where are all the people? Goby has the answer. This app pinpoints the neighborhood hot spots (including museums, hotels, eateries, and more) in your neighborhood. But its true value comes in finding nearby events. You'll discover concerts, plays, and more right around the corner.

    London—A morning's train ride away, across the Channel, English kids talk about Liverpool's soccer team in a Paris pub. Some Parisians have even started to go to work in London. In the 19^th century, Charles Dickens compared the two great rival (竞争) cities, London and Paris, in " A Tale of Two Cities". These days, it might be A Tale of One City.

    Parisians are these days likely to smile in sympathy at a visitor's broken French and respond in polite English. As jobs grew lack at home over recent years, perhaps 250,000 Frenchmen moved across the Channel. With an undersea tunnel, they could travel between cities in three hours. The European Union freed them from immigration and customs.

    Paris, rich in beauty, is more attractive. But London feels more full of life, and more fun until the pubs shut down.

    "For me, the difference is that London is real, alive," said Trevor Wheeler, a banker.

    Chantal Jaouen, a professional designer, agrees. "I am French, but I'll stay in London," she said.

    There is, of course, the other view. Julie Lenoux is a student who moved to London two years ago. "I think people laugh more in Paris," she said.

    In fact, London and Paris, with their obvious new similarities, are beyond the old descriptions. As the European Union gradually loosened controls, Londoners flocked into Paris to shop, eat and buy property (地产).

    "Both cities have changed beyond recognition." Said Larry Collins, a writer and sometimes a Londoner. Like most people who know both well, he finds the two now fit together comfortably.

    "I first fell in love with Paris in the 1950s and it is still a wonderful place," Collins said. "But if I had to choose, it would be London. Things are so much more ordered, and life is better."

    But certainly not cheaper. In fancy parts of London, rents can be twice those on Avenue Foch in Paris. Deciding between London and Paris requires a lifestyle choice.

    Like Daphne Benoit, a French journalism student with perfect English, many young people are happy to be close enough so they don't have to choose.

    "I love Paris, my little neighborhood, the way I can walk around a centre, but life is so structured," she said. "In London, you can be who you want. No one cares."

    Attractions in New York

    Empire State Building

    Towering over 444 meters into the sky, the building has an indoor and outdoor observation deck on the 86th and 102nd floor, where you can see the overall view of the New York City. The building houses more than 1000 businesses. You can buy your ticket online in advance to avoid waiting .Telephone ： 212-736-3100 Location ： 350 5th Avenue, New York, NY 10118.

    Open Hours： 08:00-02:00

    Central Park

    For more than 150 years, visitors have come to Central Park's 843 green acres in the heart of Manhattan. Since 1980, the Park has been managed by the Central Park Conservancy, in partnership with the public. You can visit the official website of Central Park to learn more about Park happenings and activities and to learn how to help Central Park Telephone： 212-310-6600

    Location: 59th to 110th Street, Manhattan Borough from Central Park West to 5th Avenue, New York

    City NY 10022

    Open Hours： 06:00-23:00

    The National 9/11 Memorial & Museum

    The National 9/11 Memorial & Museum is a place of remembrance honoring those who lost their lives in the terrorist attacks of September 11, 2001. The 9/11 Memorial Museum displays Monumental artifacts linked to the events of 9/11, while presenting stories of loss, sympathy and recovery that are central to telling the story of the 2001 attacks and the consequence. It also explores the global impact of 9/11 and its continuing significance.

    Telephone： 212-312-8800

    Location: 180 Greenwich St. World Trade Center New York City, NY 10007

    Open Hours： 09:00-20:00

    The Metropolitan Museum of Art

    At New York City's most visited museum and attraction, you will experience over 5,000 years of art from around the world. The Met is for anyone as a source of inspiration, and understanding. You can learn, escape, play, dream, discover and connect.

    Telephone： 212-535-7710

    Location ： 1000 5th Avenue, New York City, NY 10028-0198 Open Hours： 10:00-17:30

Washington, D.C. Bicycle Tours

    Cherry Blossom Bike Tour in Washington, D.C.

    Duration: 3 hours

    This small group bike tour is a fantastic way to see the world-famous cherry trees with beautiful flowers of Washington, D.C. Your guide will provide a history lesson about the trees and the famous monuments where they blossom. Reserve your spot before availability—and the cherry blossoms—disappear!

    Washington Capital Monuments Bicycle Tour

    Duration: 3 hours (4 miles)

    Join a guided bike tour and view some of the most popular monuments in Washington, D.C. Explore the monuments and memorials on the National Mall as your guide shares unique facts and history at each stop. Guided tour includes bike, helmet, cookies and bottled water.

    Capital City Bike Tour in Washington, D.C.

    Duration: 3 hours

    Morning or Afternoon, this bike tour is the perfect tour for D.C. newcomers and locals looking to experience Washington, D.C. in a healthy way with minimum effort. Knowledgeable guides will entertain you with the most interesting stories about Presidents, Congress, memorials, and parks. Comfortable bikes and a smooth tour route (路线) make cycling between the sites fun and relaxing.

    Washington Capital Sites at Night Bicycle Tour

    Duration: 3 hours (7 miles)

    Join a small group bike tour for an evening of exploration in the heart of Washington, D.C. Get up close to the monuments and memorials as you bike the sites of Capitol Hill and the National Mall. Frequent stops are made for photo taking as your guide offers unique facts and history. Tour includes bike, helmet, and bottled water. All riders are equipped with reflective vests and safety lights.

We are all stuck in the thought of having satisfying relationships, which bring some meaning to our lives and make us happy. We are so busy in finding true happiness that we often forget true happiness lies within us.

You have to love yourself first in order to love someone else. We have heard in countless inspiring speeches that self-love is the basis of a happy life. Have you ever wondered that with so many people advertising self-love, why haven't we been able to love ourselves?

One of the reasons for our failure to love ourselves is that we have been taught to be selfless from the start of time. The minute we start thinking about ourselves, everyone around us makes it their personal mission to remind us of how selfish we are. However, there is nothing wrong with putting your needs and yourself first. Self-love is not selfish. It only helps us better understand which sacrifices (牺牲) are worth making!

Actually, self-love and healthy relationships cannot be separated. Self-love is the very core of any healthy relationship. Now you might wonder how my love for myself is going to make me able to have a healthy relationship. Isn't a healthy relationship all about giving? Honestly, No.

When you know your worth, you know what you are willing to accept in a relationship and what not. You will know where to draw boundaries because you value your own opinions. You will have a clear understanding of what you need, what are your values and your limits. From now on, you should realize that true happiness lies within you and you shouldn't waste time and effort searching for peace and joy in the world outside.