Crossing your legs is an extremely common habit. While you may find it comfortable to sit with one knee crossed over the other, it might be causing health problems that you are not aware of.

    A study published in Blood Pressure Monitoring stated that sitting with your legs crossed can increase your blood pressure. The reason this happens is because the blood in your legs has to work against gravity to be pumped back to your heart, crossing one leg over the other increases resistance, making it even harder for the blood to circulate. You won't feel any immediate effects, but sitting for long periods of time will hurt you forever.

    Crossing your legs can also lead to neck and back pain. Ideally, it's best for our bodies to sit with our feet planted flat, hip width apart, on the floor, but it's not easy to maintain perfect posture all day at the office. When you sit with your legs crossed your hips are in a twisted position, which can cause one of your pelvic bones(骨盆) to rotate. Since your pelvic bone supports your neck and spine（脊椎）, this can cause pressure on your lower and middle back and neck.

    You also might notice that when you sit with your legs crossed for long periods of time your feet and legs get painful or have the feeling of being asleep. This is because when one leg sits on top of the other it causes pressure on the veins（静脉） and nerves in your legs and feet. It can cause numbness and/or temporary paralysis in the legs, ankles, or feet. While the feeling of discomfort may only last a minute or two, repeatedly crossing your legs until they feel numb can cause permanent nerve damage.

    So next time you sit down, try to get yourself in the habit of sitting with both of your feet on the floor. Not only will it help your posture and stability, but it will also save your health in the long run.

    Elizabeth Blackwell was born in England in 1821, and moved to New York City when she was ten years old. One day she decided that she wanted to become a doctor. That was nearly impossible for a woman in the middle of the nineteenth century. After writing many letters asking for admission(录取) to medical schools, she was finally accepted by a doctor in Philadelphia. She was so determined that she taught school and gave music lessons to get money for the cost of schooling.

    In 1849, after graduation from medical school, she decided to further her education in Paris. She wanted to be a surgeon(外科医师), but a serious eye problem forced her to give up the idea.

    Upon returning to the United States, she found it difficult to start her own practice because she was a woman. By 1857 Elizabeth and her sister, also a doctor, along with another woman doctor, managed to open a new hospital, the first for women and children Besides being the first woman physician and founding her own hospital, she also set up the first medical school for women.

    Nola (August 21, 1974 -November 22, 2015) was a northern white rhino（犀牛）who lived at the San Diego Zoo Safari Park near Escondido, California. At her death, she was one of only four remaining northern white rhinos in the world. The other three lived in Kenya. World Rhino Day, held on September 22, is to raise awareness of the less than 30,000 other rhinos left on Earth.

    "Rhinos need our help today, not tomorrow," Nola's lead keeper Jane Kennedy said. "Last year we lost over 1,200 rhinos just in South Africa. If we continue to lose more than 1,000 rhinos a year, in 10 to 20 years all the rhinos on the planet will be gone."

    "Unfortunately, most animals are in danger of dying out because of humans," Kennedy says." Humans have either poached（偷猎）animals, or because there are over seven billion of us, we've taken up too much of the world's resources ". Poachers illegally hunt rhinos for their horns. They sell the horns for thousands of dollars per pound, to be used for art, jewelry, and decorations. Experts believe that one rhino is poached every eight hours.

    In 1975, the San Diego Zoo Institute for Conservation Research started the Frozen Zoo, a program through which researchers have collected cell (细胞) samples from more than 8,000 different types of animals, including the northern white rhino. Scientists hope that by studying the rhino cells, they will get greater understanding of it, and will find ways to increase its numbers.

    Jane Kennedy describes World Rhino Day as "a celebration of rhinos along with an awareness campaign for everybody across the world to know that rhinos need our help." At the San Diego Zoo, children and adults are welcome to visit and speak with zookeepers to learn about rhinos. But you don't have to live in San Diego to celebrate World Rhino Day. It is observed around the world, with zoos and wildlife parks holding special events and programs to teach people about rhinos, and enable them to see the animals up close. For more information, go to www.worldrhinoday. org.

    I was driving down the road the other day, listening to sweet music coming out of my car radio. My heart felt peaceful, my mind was clear, and my soul was full of love. Even with all its problems: life seemed good. Then the music stopped and the news came on. There was talk of another famous millionaire in drug rehab (康复) after an incident with the police. There was news on the murder of a poor man whose life was supposed to be changed after winning the lottery. There was even a discussion on how much greed and excess (放肆) had damaged our world.

    Every story seemed to point once again to the old saying that money can't buy happiness. Hearing them made me think of a movie I saw many years ago on Mother Teresa's home for the dying in India. What struck me most when I watched it wasn't the unbearable poverty there. It wasn't the sickness and suffering that the people there were going through. It was rather the peaceful smiles of love, kindness, and happiness that they shared with the Sisters and with each other. These people had nothing. Many were struggling at the end of death. Yet, they knew the simple truth that so many of us here are still learning: Joy is Free.

    We can have joy and spread joy every day of our life here. Don't love or admire dollar signs and think that money will bring you happiness then. Joy can't be purchased. It can't be owned. It can only be chosen and then given freely to others. In the eyes of eternity (永恒), money is only worthless paper. The only thing that matters is the love within you and the love that you give to the world. Make that your legacy (遗产) and your life will forever be rich in joy.

Anew study suggests that Medicare could spend billions of dollars on screening (拍片检查) smokers for lung cancer that would be better spent on helping them quit and keeping others from starting.

The new study indicated that screening more often supported smokers' beliefs that they could safely continue to smoke. Most participants remained smoking because they believed screening could catch cancer early before it would threaten their lives.

"They compared how hard it was to quit smoking with how easy it was to be screened," said Steven B. Zeliadt, the lead author of the study." They engaged in magical thinking that now there's this wonderful painless external test that can save lives."

He and seven colleagues conducted the study of 37 current smokers who were offered lung cancer screening at Department of Veteran Affairs. After being screened and told the results, they were interviewed about their smoking-related heath beliefs. For about half of those, cancer was not found." Screening lowered their motivation for quitting," the team reported in July in JAMA Internal Medicine. The participants focused only on lung cancer, ignoring other potential harm of smoking.

A national study published four years ago found that annual CT screening for lung cancer three years in a row could reduce deaths among heavy smokers by about 20 percent. In an interview, Dr. Russell P. Harris, a preventive medicine specialist at the UNC-Chapel Hill, noted that" Screening is being believed by people as an alternative to stopping smoking. But stopping smoking would have huge benefits for the individual and society." Furthermore, smoking causes many other cancers.

Dr. Harris agreed that rather than screening, money is better spent on smoking prevention. He suggested providing free stop-smoking aids, sponsoring anti-smoking advertising and raising taxes on tobacco products and the age at which people are allowed to buy them.

Let's face it. You're likely reading this article in an effort to avoid some other tasks you're procrastinating (拖延) to learn how to stop procrastination, but the clock is ticking. So why can't you seem to get rid of that?

Though the psychological causes are still debated, there's a human tendency to over or underestimate the value of a reward based on its temporal proximity (时间接近). This is often referred to as temporal discounting. For example, if I offered you $100 today or 110 in a month, most would take the hundred and run. But what if instead I offered you 100 dollars in a year or 110 in a year and one month, you might say to yourself if I can wait a year, I can wait the extra month.

But the time and value difference are the exact same in each example. It turns out that human motivation is highly influenced by how near the reward is meaning. The further away the reward is, the more you discount its value. So being online is more appealing than preparing for your test. The problem is surfing the Internet provides many small quick and continuous rewards unlike your test scores which are a future one.

So how do you overcome the urge to put off so many tasks?

Unfortunately, there is no definite answer, but try rewarding yourself with a timely snack or other enjoyable activities. The Pomodoro Technique makes use of a timer to work for 25 minutes straight and when you've done, this gives yourself the reward with a 5-minute break. Then start the working clock again. Gradually increasing the amount of work time you put in will improve your time management skills.

It's been shown that creating a costly deadline is also an effective way to manage your working habits. And try to enjoy the process of achieving something instead of thinking only our minutes of suffering.