You get anxious if there's no wi-fi in the hotel or mobile phone signal up the mountain. You feel upset if your phone is getting low on power, and you secretly worry things will go wrong at work if you're not there. All these can be called “always on” stress caused by smart phone addiction.

    For some people, smart phones have liberated them from the nine-to-five work. Flexible working has given them more autonomy（自主权）in their working lives and enabled them to spend more time with their friends and families. For many others though, smart phones have become tyrants（暴君）in their pockets, never allowing them to turn them off, relax and recharge their batteries.

    Pittsburgh-based developer Kevin Holesh was worried about how much he was ignoring his family and friends in favour of his iPhone. So he developed an app — Moment — to monitor his usage. The app enables users to see how much time they're spending on the device and set up warnings if the usage limits are breached（突破）. “Moment's goal is to promote balance in your life,” his website explains. “Some time on your phone, some time off it enjoying your loving family and friends around you.”

    Dr. Christine Grant, an occupational（职业的）psychologist at Coventry University, said, “The effects of this 'always on' culture are that your mind is never resting, and you're not giving your body time to recover, so you're always stressed. And the more tired and stressed we get, the more mistakes we make. Physical and mental health can suffer.”

    And as the number of connected smart phones is increasing, so is the amount of data. This is leading to a sort of decision paralysis（瘫痪）and is creating more stress in the workplace because people have to receive a broader range of data and communications which are often difficult to manage. “It actually makes it more difficult to make decisions and many do less because they're controlled by it all and fell they can never escape the office,” said Dr. Christine Grant.

    Recent summer temperatures in parts of Australia were high enough to melt asphalt. As global warming speeds up the heat and climatic events increase, many plants may be unable to cope. But at least one species of eucalyptus tree can resist extreme heat by continuing to “sweat” when other essential processes stop, a new study finds.

    As plants change sunlight into food, or photosynthesize (光合作用), they absorb carbon dioxide through pores on their leaves. These pores also release water via transpiration(蒸腾), which circulates nutrients through the plant and helps cool it by evaporation(蒸发). But exceptionally high temperatures are known to greatly reduce photosynthesis—and most existing plant models suggest this should also decrease transpiration, leaving trees in danger of fatally overheating. Because it is difficult for scientists to control and vary trees' conditions in their natural environment, little is known about how individual species handle this situation.

    Ecologist John Drake of the S.U.N.Y. College of Environmental Science and Forestry and his colleagues grew a dozen Parramatta red gum (Eucalyptus parramattensis) trees in large, climate-controlled plastic pods that separated the trees from the surrounding forest for a year in Richmond, Australia. Six of the trees were grown at surrounding air temperatures and six at temperatures three degrees Celsius higher. The researchers withheld (扣留) water from the surface soil of all 12 trees for a month to imitate a mild dry spell, then induced a four-day “extreme” heat wave: They raised the maximum temperatures in half of the pods（three with surrounding temperatures and three of the warmer ones）— to 44 degrees ℃.

    Photosynthesis ground to a near halt in the trees facing the artificial heat wave. But to the researchers' surprise, these trees continued to transpire at close-to-normal levels, effectively cooling themselves and their surroundings. The trees grown in warmer conditions coped just as well as the others, and photosynthesis rates bounced back to normal after the heat wave passed, Drake and his colleagues reported online in Global Change Biology.

    The researchers think the Parramatta red gums were able to effectively sweat — even without photosynthesis — because they are particularly good at tapping into water deep in the soil. But if a heat wave and a severe drought (干旱) were to hit at the same time and the groundwater was exhausted, the trees may not be so lucky, Drake says.

    Other scientists call the finding encouraging. “It's definitely good news,” says Trevor Keenan, an ecologist at Lawrence Berkeley National Laboratory, who was not part of the study. “It would be very interesting to know how this translates to other species,” he adds. Drake hopes to conduct similar experiments with trees common in North America.

    Renowned British physicist Stephen Hawking died peacefully at his home in the British university city of Cambridge in March 14 at age 76.

    Hawking, whose 1988 book "A Brief History of Time" became an unlikely worldwide bestseller and cemented (奠定) his superstar status, dedicated his life to unlocking the secrets of the Universe. He held the post of Lucasian Professor of Mathematics at the University of Cambridge, which is a position that was once held by Sir Isaac Newton.

    Born in 1942 in Oxford, where his parents spent the final months of pregnancy to avoid the bombings of London, Hawking was said to have been a good student although it wasn't until he was in his 20s that his true potential began to really shine through. Having initially wanted to study Mathematics, Stephen Hawking chose, instead, to read natural sciences with emphasis on Physics.

    Having found University life boring, so much so that he joined the University rowing team to relieve the boredom, it was only following an oral examination that he was awarded a first class degree.

    While at Cambridge, Hawking was diagnosed with a motor neurone (神经元）disease. He was initially given two to three years to live. The illness gradually robbed him of mobility, leaving him confined to a wheelchair, almost completely paralysed and unable to speak except through his trademark voice synthesiser (合成器）.

    Stephen Hawking led an incredible and well documented life. He was referred to in many TV programs, films, and even songs, and appeared as himself in a number of programs including Red Dwarf and the Big Bang Theory. His genius and wit won over fans from far beyond the world of astrophysics (天体物理学）, earning comparisons with Albert Einstein and Sir Isaac Newton.

    My friend Jason and I wanted to do something to help other people who are less lucky and help us grow at the same time. After we decided that we would volunteer in Nepal, I did some surveys on the Internet and I found an organization called Volunteer(志愿者) Nepal and felt strongly that it was the right choice for us.

    While making our plans, Jason and I realized that others might like the chance to be a part of our experience. So before leaving for Nepal, we asked the people we know whether they would be interested in donating(捐赠) money or goods to Nepal Orphans Home.

    One friend, whose family owns a shop called Drake Supermarket, told others about it. Many people wanted to donate something. We received donations that filled 29 boxes with sporting goods, toys, coloring books, pencils, children's books, and more, The boxes were later taken to Drake's warehouse(仓库) where I prepared them for shipment. Drake agreed to ship them to Nepal for free .

    The boxes had arrived at the Volunteer House when we arrived there. The next day, Jason and I opened the boxes. The children from the orphanages(孤儿院) stood in a line and were able to choose a gift. This took about an hour, but the looks on their faces and the happiness that we saw in their eyes made it one of the best days of our life.

    We visited the orphanages there in the following days. Being with the children at the orphanages was both sad and wonderful. I'm sure that anyone who has volunteered will understand what I mean by that. My experience as a volunteer was very useful. It has changed me as a person and the way I viewed life in the past.

    Planning to get away? Think passport first

    If you're planning to get away from it all this year, you should think passport first. Checking you have a valid passport before you book your trip takes minutes but could save you the trouble and cost of not being able to go.

    Renewing (更新) your passport before it runs out

You can renew your passport up to 9 months before it can no longer be legally used. So take the time now and save the tears later.

    Applying for a passport for the first time

    Our eligibility (资格) checks mean that it takes a minimum of one week to issue (颁发) a passport. So make sure you don't leave it to the last minute, and apply in plenty of time.

    Help with your application is just around the corner

    Selected Post Office branches and Worldchoice travel agents offer a Check and Send service that helps you with your application. It's convenient and you should receive your passport within 2 weeks.

    If you need to apply for or renew a passport, you can either:

    Pick up a Passport Application Form at Selected Post Office branches and Worldchoice travel agents.

    Or call the Application Form Request line on 0901 4700 100 or visit www.passport.gov.uk

    If your need is urgent, call 0870 521 0410 for an appointment at one of our offices. We can't guarantee to see customers without an appointment.

    From 14th January a guaranteed same day (passport renewals only) or one week service will be available from passport public counters.

    Calls will be charged 60p per minute and the cost per call should not normally be more than 90p.

    Calls are charged at national rates.

    Electronic book publishing has many of the same risks and opportunities as electronic music publishing. By delivering text direct to the reader's computer screen, the e-book could cut down costs, and allow creators to deal directly with their audience, by passing (绕开) traditional publishers and traders. But it also raises the possibility of mass piracy (盗版). Phil Rance, founder and managing director of Online Originals, a London-based e-book publisher, sums it up, "No one wants Napster (在线音乐服务) to happen to books."

    Indeed, the most popular MP3may have put the frighteners on an industry that generally operates some way behind the "bleeding edge". The Meta Group, a leading US-based market researcher, says publishers are far too concerned about protecting their rights, "We believe all the recent legal control over Napster is like putting a finger in a river that is already overflowing. Publishers need to deal with reality and come up with new ways to develop wide electronic distribution, asking the question: How can we use the certainty of wide distribution to our advantage."

    At the moment, most publishers would like to limit the use of e-books to the person who bought them, or to the computer used to download them. If that can be done, e-books become just an extra income stream in a publishing industry that would continue to operate the way it does today, according to Terry Robinson, business manager for Adobe's e-paper group. "If you've cracked the digital rights aspect, you've cracked the market." He says.

    Robert Nichols, Books Director at BOL agrees, "Rights management is absolutely important. Publishers just say that 'until copyright is secure, we are not going to talk'."