How cool can libraries be in an era of iPods and Kindles? Morethan you think．Only if youknow where to go.

Central Library: Seattle, Washington, United States

The Central Library in Seattle is modern and fashionable and hastourists from around the world paying visits and taking tours. It was designedby Dutch architect Rem Koolhaas and American designer Joshua Ramus. Tours beganin 2006, two years after its opening. The library holds various artexhibitions, book signings and other events, while visitors can stop by theChocolate cart for a coffee and scan through the gift shop anytime.

Trinity College Library: Dublin, Ireland

The Trinity College Library in Dublin is the oldest library inIreland, founded in 1592 by Queen Elizabeth I. It is the largest single libraryin the world, also known as the Long Room, which contains more than 200,000 ofthe library's oldest books. The Long Room houses one of the oldest harps（竖琴）in Ireland.Dating to the 15th century, the old harp is the model for the symbol foreland.

Geisel Library, University of California: San Diego, UnitedStates

At first glance, it looks like a spaceship. Architect WilliamPereira, who helped design actual space launch facilities at Cape Canaveral inHouston, Texas, designed the library in 1970. It has been featured in sci-fifilms, short stories and novels. The library hosts “Dinner in the Library,”which invites readers for cocktails, and also a special speech fromdistinguished authors．

TU Delft Library: The Netherlands

The library at the Delft University of Technology wasconstructed in 1997 and has more than 862,000 books, 16,000 magazinesubscriptions and its own museum．The buildingitself exists beneath the ground, so you can't really see the actual Library.What makes it interesting is the roof, which is a grassy hill. The roof covers5,500 square meters. And it has become one of the most striking and greeneststructures in the area.

    Passenger Information

    Carry-on Bag Rules

    When travelling on China Southern planes, we ask our customers to follow our simple bag rules.

—Each passenger is allowed to bring one bag onto the plane.

—Weight limit: Each carry-on bag may weigh up to 10 kilos.

—Size limit: Each carry-on bag can be up to 110cm long, 60cm high and 30cm wide.

—Additional bags and oversized/overweight bags may be allowed on the plane if there is enough room. There will be a fee for such bags (see the table below). Please note that if your bag breaks more than one rule then you must pay a fee for each rule broken.

    Safety Rules

    For the safety of our passengers, the following items must not be taken onto the plane:

—Bottles containing gas (e.g. cigarette lighter)

—Bottles containing any cream, oil or other liquid that are over 100ml.

    Note:

    If you have any liquid medicines over 100ml that you must use during your flight, please contact our customer service manager on 34533566 to make arrangements at least 24 hours before your departure. You will need to have a doctor's letter explaining why you need the medicine.

    Bag Fees

    No bag over 15 kilos will be allowed on the plane. **No bag over 150cm long or 80cm high may be taken on the plane. Passengers must put such bags in the plane's storage.

    Try this: For an entire day, forget about the clock. Eat when you're hungry and sleep when you're tired. What do you think will happen?

    You may be surprised to find that your day is much like most other days. You'll probably get hungry when you normally eat and tired when you normally sleep. Even though you don't know what time it is, your body does. These patterns of daily life are called circadian rhythms(生理节奏), and they are more than just habits. Inside our bodies are several clocklike systems that follow a roughly 24-hour cycle. Throughout the day and night, our inner clocks direct changes in temperature, body chemicals, hunger, sleepiness and more.

    Everyone's rhythms are different, which is why you might like to stay up late while your sister always wants to go to bed early. But on the whole, everyone is programmed to feel tired at night and energetic during the day. Learning about our body clocks may help scientists understand why problems arise when we act out of step with our circadian rhythms. For example, traveling across time zones can make people wake up in the middle of the night. Regularly staying up late can make kids do worse in tests.

    "There is a growing sense that when we eat and when we sleep are important parts of how healthy we are," says Steven Shea, director of the Sleep Disorders Program at Brigham and Women's Hospital in Boston.

    One way to learn about how our body clocks tick is to mess them up and see what happens. That's what neurologist(神经病学家)Frank Scheer and his workmates did in a recent study. Staying up night after night, their studies suggest, could make kids extra hungry and more likely to gain weight. And regularly sleeping too little, Scheer says, may be one cause of the recent increase in childhood obesity.

How to Prevent Dehydration

    When the weather's warm, you need to make sure you drink enough water. But did you know that you lose your sense of thirst as you get older? This means you5re more likely to become dehydrated, making you more prone to (有倾向) falls, heart disease, urinary-tract infections, kidney stones and confusion. A study from Loughborough University in the UK has shown that drivers who had only a little water an hour made twice as many mistakes as motorists who were properly hydrated. In fact, they made a similar number of errors to what you'd expect from someone over the drink-drive limit.

    So how do you know when you're dehydrated? Warning signs include:

    Feeling tired

    Dry mouth and dry skin

    Dark urine

    Reduced appetite (食欲)

    Reduced concentration

    Headache

    Constipation.

    But you might not notice any symptoms (症状)at all，so to make sure you stay hydrated:

    Keep a glass of water by your side when you're at home, and drink it regularly.

    Form a new drinking habit—for example, when watching TV, always reach for the water glass during an ad break.

    Take a small bottle of water with you when you go out.

    Always drink a large glass of water with a meal.

    Eat fruit and vegetables with high water content.

    Draw up a weekly water card—a bit like a coffee loyalty card—with a target of eight glasses of water a day. Mark it every time you have a glass of water. Award yourself a prize when ifs full at the end of the week.

    Drink water before, during and after you take any exercise.

    Many Americans think of driverless cars as a futuristic technology that will revolutionize travel in cities and along state highways. But recent experiments are proving that autonomous vehicles also have the potential to improve the quality of life for millions of Americans underserved by traditional ways of transportation, such as the elderly and disabled, so long as lawmakers make smart policies that pave the way for innovation.

    A retirement community in San Jose, Calif, which has been transformed by a small fleet (车队) of driverless taxis, shows the potential of self-driving cars to transform people's lives. Built by a tech start-up called Voyage, the modified (被改进的) Ford Fusions are currently limited to a two-mile road, but residents are already having the benefits of these autonomous vehicles, which allow them to participate in social activities they would otherwise be unable to enjoy simply because they could not get to them.

    When the trial run finally expands to 15 miles of road, these residents—whose average age is 76—will also have a convenient and reliable new way to appointments. As these cars continue to serve residents there, it is easy to understand why California is moving to simplify regulations for the industry.

    In Michigan, forward-thinking policies have the potential to unlock other hidden benefits of autonomous vehicles, especially for those with physical disability. The Michigan Disability Rights Coalition has strongly advocated for the development of this technology, saying that it could give people with disabilities greater opportunities in the workforce and enable them to lead more fulfilling (满意的), independent lives.

    Many recognize that autonomous vehicles will be the future of transportation, but it is too often overlooked that this future cannot arrive fast enough for millions of Americans who are forced to depend on others for day-to-day travel. The policymakers should follow the lead of places like California and Michigan, and pass rules and regulations to unlock these hidden benefits of driverless cars.

Great Activities for Nature Lovers

Hiking

One of the easiest and most accessible ways to get close to nature is by setting out on a good old fashioned hike. Hiking generally doesn't require any fancy equipment or special skills, just a piece of map and a thirst for adventure. This activity can be as relaxing as you make it.

Backcountry Camping

Why limit yourself to just a day hike when you can have a full weekend for a longer adventure? Backcountry camping involves packing your tent，sleeping gear, food, and water on your back to set up camp in a remote location. I you're an experienced hiker and camper, this is an excellent way to test your survival skills and explore the wilderness.

Mountain and Road Biking

Unlike long hikes through the woods, biking allows you to cover more ground and travel farther in nature. Mountain biking typically involves riding up and down steep slopes, between trees, and over rocks. If this sounds too intense or your tires aren't suited for rugged terrain(地形), consider taking a road bike on paved trails through forest preserves or along country roads.

Gardening

Contrary to popular belief, you don't have to travel beyond your own backyard to experience the beauty of nature every day. If your personality is less adventurous or your mobility restricted, consider planting a garden to grow your own vegetables, fruit, herbs，or flowers. There's something truly satisfying about mixing up a salad with fresh ingredients you grow yourself. One of the best parts about spending time in gardening is that it doesn't have to break your budget and anyone can do it.