I was in my first year of college, making friends and enjoying life, but then my whole world turned upside down. I had a heart attack. It felt like someone was stabbing (刺) me in the chest with a knife over and over again.

    After three months of rest I went back to college, but then things took a turn for the worse. I was staying at my Nana's house and woke up in the middle of the night with a terrible pain in my chest. I knew I was having a heart attack again.

    I couldn't even shout for help. Luckily my grandpa was going to the toilet and heard me falling out of bed. If it wasn't for him, I probably wouldn't be here.

    The two holes in my heart were causing the problems and I needed an operation immediately to repair them. Unfortunately, the surgery didn't go well and they only managed to repair one of the holes.

    When I woke up from the operation, I had a really dry mouth and couldn't wait to have something to eat and drink. The biggest shock of all came when I was told that I needed a heart transplant and was put on the register. The doctors were stunned at how quickly heart failure came on – it usually takes years, but it took my heart less than six months to get to that stage. My whole world came crashing down, but I stayed strong. It was a choice between crying every day and getting on with my life.

    As time went on, life became even harder. I hated feeling weak all the time and needing help with everything. It got to the point where I thought I would never get a new heart. I was diagnosed with depression.

    Even though I thought that Christmas 2008 would be my last, I really enjoyed it and even had a good New Year. Everyone was crying for me when the clock struck midnight and they told me to keep fighting.

    A week later, I got a call from the doctors saying they'd found a suitable donor (捐赠人). My wish came true and thankfully the operation went well. I spent four hours in surgery where they took out my old heart and put a new one in. When I woke up I burst out crying. I had a second chance at life.

    People who have lost the ability to understand or use words due to brain damage are called aphasics（失语症患者）.Such patients can be extremely good at something else.From the changing expressions on speakers' faces and the tones of their voices,they can tell lies from truths.

    Doctors studying the human brain have given a number of examples of this amazing power of aphasics.Some have even compared this power to that of a dog with an ability to find out the drugs hidden in the baggage.

    Recently,scientists carried out tests to see if all that was said about aphasics was true.They studied a mixed group of people.Some were normal;others were aphasics.It was proved that the aphasics were far ahead of the normal people in recognizing false speeches—in most cases,the normal people were fooled by words,but the aphasics were not.

    Some years ago,Dr.Oliver Sacks wrote in his book about his experiences with aphasics.He mentioned a particular case in a hospital.Some aphasics were watching the president giving a speech on TV.Since the president had been an actor earlier,making a good speech was no problem for him.He was trying to put his feelings into every word of his speech.

    But his way of speaking had the opposite effect on the patients.They didn't seem to believe him.Instead,they burst into laughter.The aphasics knew that the president did not mean a word of what he was saying.He was lying!

    Many doctors see aphasics as people who are not completely normal because they lack the ability to understand words.However,according to Dr.Sacks,they are more gifted than normal people.Normal people may get carried away by words.Aphasics seem to understand human expressions better,though they cannot understand words.

    Kids undergo a large amount of pressure and stress during their school exams, which can often become quite overwhelming (to much) for them. It may be the first experience of stress, at this level, they have ever experienced and therefore quite frightening. Yes, you may say that it's all a part of growing up and therefore good lessons for them to learn, and to an extent I agree with you. However, it's important to learn how to prepare for life's challenges so that they aren't overwhelming or scary and so that we are able to manage them the best we can.

    Here are some tips you can use during your kids exam time.

    Break their revision plan down into small parts. Doing this will help transform what once seemed like a huge impossible task into a more manageable one.

    Help them arrange properly so that the subjects they like the least (perhaps ones that require more time and effort) are worked on first; once they are out of the way, it will help reduce the worry.

    Plan week on week to make sure they are on track. Ticking items of a list each week will help them to feel good about themselves and their progress.

    Create rewards for all the ticks - a favourite TV programme, a delicious snack, an hour's surfing the Internet, computer games or whatever it was that they enjoy the most. This will encourage them to carry on and make them feel good.

    Think of strategies on how to deal with exams calmly so their anxieties don't get the better of them.

    Talk about times in their lives when they had been successful at something and look at the qualities they used to get them there - determination, persistence, hard work, patience, positivity, dedication - discuss how they can apply these skills to their exams.

    Acknowledge that if they do their best that is good enough.

    Ensure they realize that this period in their lives will pass and that exams are only a temporary time in their lives; nothing can and does last forever.

    Ensure they keep their eye on the prize: enjoying their long summer holiday when the exams are finished; giving them something to look forward to will help to motivate them and provide a positive end in sight.

    A latest research led by researchers from the National University of Singapore (NUS) has found a clear link between the color of a taxi and its accident rate. An analysis of 36 months of detailed taxi, driver and accident data from two fleets of yellow and blue taxis in Singapore suggested that yellow taxis have fewer accidents than blue taxis. The higher visibility of yellow makes it less difficult for drivers to avoid getting into accidents with yellow taxis, leading to a lower accident rate.

    The study was led by Prof Hou. To test whether there was a relationship between the color of a taxi and the number of accidents the taxi had, the research team analyzed data collected by the largest taxi company in Singapore. The researchers found that yellow taxis have about 6.1 fewer accidents per 1,000 taxis per month.

    They also studied the economic effect of changing the color of the entire fleet of taxis to yellow. The Singapore taxi company involved in the study owns about 16,700 taxis in a ratio (比例) of one yellow to three blue taxis. If a commercial decision is made to switch from blue to yellow taxis, 76.6 fewer accidents will occur per month or 917 fewer accidents per year.

    Assuming an average repair cost of $1,000 per car and a downtime of six days, the color of all taxis to yellow could produce an annual saving of $2 million.

    "We are eager to continue to validate(证实) the findings of our study by looking at the use of yellow in other types of public transport, such as school buses. For example, we hope to compare the accident rates of yellow school buses against those of other colors to find out if yellow is indeed a safer color for school buses. Besides, we're also interested to look at private-hire vehicles and do a comparison of the accident rates of vehicles that are of different colors, "explained Prof Hou.

    About 6 years ago, I was on a plane next to a woman. I was tired and wanted to take a nap. But before I could go into "ignore pattern", she tapped me on the shoulder to introduce herself.

    "Hi, my name is Helga!"

    We got to talking and eventually it came up that I had started an organization in high school called R.A.K.E.(Random Acts of Kindness, Etc.). As I described what we did, Helga got very serious and told me that she admired me for that. She told me a story about the last time she had flown. She was on the way to Arizona because she had gotten sudden news that her dad's health was on the decline. Later her father's physician called to inform her that her dad had rather suddenly passed away. For the 3-hour plane ride, she sat in silence around strangers.

    When she arrived at the airport in Arizona, she walked to the nearest wall, sat down, and cried. And here is the part I'll never forget about Helga's story. For 2 hours she sat and wept while thousands walked to and fro in the airport. Helga looked at me and said, "Houston, not a single person stopped and asked if I was okay that day." It was that day that I realized how much we need each other. It was that day I realized that kindness isn't normal.

    Kindness isn't normal. That has stuck with me all these years especially now. I work in schools nationwide speaking about sympathy, kindness, empathy (同理心) and love. I'm reminded all the time that, for many of us, kindness is not usually our default setting. We spend so much time worrying about our problems, our lives, our insecurities, getting to our flight so we walk by or ignore people in need of help.

    So, I've made it my mission to do my part in sharing stories with students, teachers, and parents about our need for character and sympathy. I'm always be on the lookout for the little opportunities that surround me every day to do something nice.

    Antarctica has become one of the world's most popular tourist destinations. Since 1969, the average number of visitors to the continent has increased from several hundred to over 34,000 today. All activities in Antarctica are heavily supervised by the Antarctic treaty for environmental protection purposes and the industry is largely managed by the International Association of Antarctica Tour Operators (IAATO).

    The first expedition (探险) to Antarctica with travelers was in 1966, led by Swedish explorer Lars Eric Lindblad. He wanted to give tourists first-hand experience of the ecological sensitivity of the Antarctic environment, in order to educate them and promote a greater understanding of the continent's role in the world. In 1969, Lindblad built the world's first expedition ship, the MS Lindblad Explorer, which was specifically designed to transport tourists to Antarctica.

    In 1977, both Australia and New Zealand started to offer scenic flights to Antarctica through Qantas and Air New Zealand. The flights often flew to the continent without landing and returned to the departure airport. The experience was an average 12 to 14 hours with up to 4 hours of flying directly over the continent. The flights from Australia and New Zealand stopped in 1980. It was largely due to the Air New Zealand Flight 901 accident on November 28, 1979. In 1994, flights to Antarctica continued again.

    Despite the potential dangers and risks, trips to Antarctica continued to grow. According to IAATO, 34,354 travelers visited the continent between 2012 and 2013. Americans contributed to the largest share with 10,677 visitors, or 31.1%, followed by Germans 11.1%, Australians 10.7%, and the British 10.2%. The rest of the visitors were from China, Canada, Switzerland, France and elsewhere.

    The cost of a trip to Antarctica can range from as little as $3,000-$4,000 to over $40,000, depending on the scope of transportation, housing, and activity needs. The higher end packages typically involve air transport, on-site camping, and a visit to the South Pole.