We've all experienced that feeling that comes when your phone makes a sound to tell you that its battery level is low. It often comes at the worst times – when you're out on a trip and don't have a charger, or when you're expecting an important phone call.

    Indeed, this feeling is so common that South Korean electronics manufacturer LG has given it a name: low battery anxiety.

    According to a survey of 2,000 US adults conducted by the company last year, 90 percent of respondents said that they panic if their battery level reaches 20 percent or lower.

    And last month, UK telecommunications service provider 02 found that around 15.5 million Britons live in “constant fear” of their mobile phones running out of power, according to a survey by the company.

    “The problem is not about being unable to make calls, but is rooted in the fact that smartphones are now where we store digital memories,” noted the Daily Mail.

    However, battery worries don't just affect smartphone lovers. Many owners of electric vehicles also suffer from so-called “range anxiety”. This refers to the concern that the vehicle may not make it to its destination before the power runs out.

    Meanwhile, it isn't just low power that people worry about. A study carried out by South Korea's Sungkyunkwan University and China's City University of Hong Kong found that many of us also worry about not having constant access to our phone.

    This condition is known as nomophobia, short for “no mobile phone phobia（恐惧症）”. Symptoms include feeling uncomfortable when access to one's phone isn't possible, being unable to turn off your phone, and constantly topping up the battery to make sure it never dies.

    So, why do so many people treat their smartphone with such importance? The underlying reason may be that they keep us connected to the people around us, and if we're unable to use our phone, we feel like we're cut off from our social life.

    With products with bigger batteries being released all the time though - such as Xiaomi's Mi Max smartphone range or Tesla's Model S cars – battery anxiety may hopefully soon be a thing of the past.

    Most people can't live to 100. Those who do live so long can hardly walk, let alone take part in any activities. A few people, however, take part in dangerous activities even though they are more than 100 years old. They keep going and going! There is a great grandmother who likes challenging herself although she is 101 years old this year.

    Mary Hardison believes that people should always be cheerful and more importantly, take on all kinds of adventures while they physically still can. So, instead of celebrating her 101st birthday with a boring party, she decided to go paragliding（滑翔跳伞）﹣an idea she got from her 75﹣year﹣old son who recently took it up as a hobby.

    So on her birthday, cheered on by her big family, she tied herself up together with expert instructor Kevin Hintze, and jumped down fearlessly from the sky near her home in Ogden, Utah. And, it was not just a simple jump either. According to Kevin Hintze, the grandmother encouraged him to turn around, as they made their way down.

    This is not the first time that Mary has done something "wild" and "crazy". For her 90th birthday she rode all the adult rides at Disneyland. And, she is not done yet﹣ For her 102nd birthday she hopes to go down the 3,000 feet Alpine Slide at Utah's Park City Mountain Resort!

    Not surprisingly, this great action has made Mary Hardison very famous and also earned her a place in the Guinness World Records where she broke a 2007 record set by a 100﹣year﹣old British woman. What an amazing lady!

    Elephants might be the most well-known and well-loved animal in African wildlife. But conservation (保护) of the African elephant still faces special difficulties. While the elephant population is half of what it was 40 years ago, some areas of Africa have more elephants than populated areas can support. That's why AWF scientists are studying elephant behavior, protecting habitats and finding ways for humans to live peacefully with elephants in Africa.

    Years ago, overhunting and the ivory trade were the biggest threats to elephants' survival. Luckily, ivory bans (禁令), hunting rules and protected areas protect elephants from these dangers today.

    The 21st century brings a different challenge to elephant conservation—land-use. Elephants walk across borders and outside parks and other protected areas. So they often destroy crops, causing conflicts (冲突) between local farmers and these big animals.

    Successful conservation strategies must allow elephants to walk freely in their natural habitats while reducing conflicts between elephants and local people.

    AWF researchers are searching for a way to give both elephants and people the space they need. The AWF is collecting information on elephant habitats and behavior. The information they gather will help to develop the widest possible space for elephants.

    The AWF is helping elephants by protecting their habitats. And they also work with local farmers to improve their life in order to encourage them to protect rather than destroy elephants.

    Scientists have found evidence of a link between social and economic status and childhood attention deficit disorder(ADHD)(注意力缺陷多动障碍)in the UK. A team led by the University of Exeter Medical School analysed data from the Millennium Cohort Study, a database of more than 19, 500 UK children born between 2000 and 2002 .The study was published in the Journal of Child Psychology and Psychiatry.

    Findings showed that more children with ADHD came from families below the poverty line than the UK population as a whole, with average family incomes for households whose study child was affected by ADHD at £324 per week, compared to £391 for those whose child was not. The study found the odds (机会)of parents in social housing having a child with ADHD was roughly three times greater than for those who owned their own homes.

    The team also found that the odds of younger mothers having a child with ADHD were significantly higher than for other mothers. Mothers with no qualifications were more than twice as likely to have a child with ADHD than those with degrees, and lone (孤独的)parents were more likely to have a child with ADHD diagnosis than households with two live-in parents.

    Information was gathered from surveys when the cohort children were nine months old, and at the ages of three, five, seven and eleven.

    Dr Ginny, of the University of Exeter Medical School, who led the study, said, "There is a genetic element to ADHD, but this study provides strong evidence that ADHD is also associated with a disadvantaged social and economic background. Some people believe that ADHD in children causes disadvantage to the economic situation of their family, but we found no evidence to support that theory. It's important to discover more about the causes of this disorder so that we can look towards prevention, and so that we can target treatment and support effectively. "

A few years ago, I returned from a family vacation in Mexico, where I'd bought myself a beautiful blue candle. I was so excited to light it. But when I got home and unpacked it, I thought, "Today is not the day. I'm going to save it for the right occasion." So I put it in my closet and forgot about it.

Two years passed, I remembered my candle and I thought, "Today is the day. I'm going to light it." So I went to the closet and opened up the box—and my beautiful blue candle had turned into wax. Now what struck me is my candle did exactly what it's designed to do—melt—but it did it without me.

That candle which melted triggered (触发) something in me. It old the story to my friend Gillian. The next time I was over at her house, she took me on a tour and she showed me that all of her candles had been lit. She told me, "I had waited a year to light those candles. You told me the story, and I lit them all the next day. "

I believe, however, that those small actions send a big message and show you're no longer letting life slip— or melt—by.

Here's my advice for you: Whatever object you answered "yes" to earlier, please use it with in the next week. Pull out your china for a random Tuesday night, open the Scotch, and cut the tags off a jacket. And don't let your candle melt in the closet.