Unlike most other holidays, the history of April Fools' Day. Sometimes called All Fools' Day, is not as the totally clear. The only point in time that can be agreed on as the beginning of this tradition was 1582,in France. Before that year, the New Year was celebrated for eight days, beginning  on March 25.The reform of the calendar celetxration reached the highest point on April l_With the riform of the calendar under Charles 1X,the Gregorian calendar (公历, 阳历）was introduced, and New Year's Day was moved to January 1.

    However, because in those days communications were not as developed as they are today, many people did not receive the news for several years. Some people refused to accept the new calendar and continued to celebrate the New Year on April, These backward people were considered “foots” by other peopk. They were often sent on “fools” errands (徒劳无益的工作)or were made the taragets of jokes.

    This developed, over time, into a tradition of playing a trick on someone on the first day of April. The tradition eventully spread to England and Scotland in the eightreenth century. It was later introduced to the American colonies of both the Britain and Francc.April Fools' Day thus developed into an  international fun feast,so to speak,with different nationalities specializing in their own kind of humor at the expense of their friends and families.

    Sonya and her family have been homeless since she was 3 years old. Over the years, they have moved more than 15times to different shelters around New York City. Moving around was hard on Sonya。At school, Sonya hid her homeless from teachers and other students. She didn't want to be treated differently from other kids.

    In sixth grade, Sonya discovered a way to deal with some of her stress. She began studying dance at her middle school. “IT was a way for me to express myself, instead of just holding everything in,”she explains. Soon, Sonya auditioned（试演）for a summer dance camp run by Alvin Alley, a famous dance company. She was accepted. “I was excited,”says Sonya.

    Dancing became an even more important part of Sonya's life in high school. But things were not going well for Sonya at school. Each time her family moved to a new shelter, Sonya often took care of her younger sisters and brothers. She helped them get ready in the morning and took them to school. They would be on time, but Sonya would be late.

    Worrying about her family kept Sonya from thinking about her own future. That changed the summer after 11^th grade. Sonya learned she would have to go to summer school to graduate. She became determined to succeed, no matter what. “It was a wake-up call,”she says.“I had to focus on school and on myself.”

    Sonya made up the work that she had missed, and finally graduated from high school. No one in her family had gone to college before. But in September 2015, Sonya enrolled in the State University of New York at Potsdam. She plans to become a doctor for kids and to teach dance to children who have disabilities.

    One night, Pilar was in a deep sleep when she was woken by her cat Inti. Inti was meowing wildly outside Pilar's bedroom and throwing himself against the closed bedroom door. When Pilar opened her eyes, she saw that her bedroom was filled with smoke. As she escaped her house with Inti in her arms, she saw that a fire was burning in her kitchen. Pilar could easily have lost her life, but Inti would not let that happen. Even though Inti could have escaped the house through a cat door, he wouldn't leave Pilar.

    As amazing as this story is, it is not as uncommon as you may think. Take the example of Charlotte Lee and her horse, Thunder. One summer night, the whole family was asleep with the windows open. It was normally very quiet where they lived. Suddenly, there was a loud noise. Charlotte woke up from her sweet dream, and the noise continued. Then she heard a horse running fast towards the house. The next thing she saw was Thunder standing outside her window, neighing(嘶叫) and shaking his head. She knew something was wrong. Charlotte quickly got everyone out of the house before the earthquake hit. Thunder has saved her life.

    There are also stories of wild animals coming to the rescue of humans. One animal known to be a friend of humans is the dolphin. Once, Todd Endris was surfing with his friends when he was attacked by a 13-foot(4-meter) shark. In the middle of the attack, a group of dolphins came to his rescue by forming a protective ring around Endris until he could get safely to shore. Without the help of the dolphins, there is little chance that Todd could have escaped.

    No one is sure why animals have so often come to our rescue. However, it is clear that humans and animals enjoy a close relationship. It is important that we care for them as much as we can.

Smart Cameras to Help You Take Better Photos

    Google Clips

    One of the latest to launch is Google Clips. It is designed to be put somewhere in a room to take pictures by itself. It can also be attached to an object or a person's clothing.

    Google says machine learning helps the camera choose the best times and situations for taking pictures and videos. Interested buyers can join a waiting list to be informed when it is on the market.

    GoPro Hero

    GoPro also uses machine learning to power its QuikStories characteristic. This tool takes existing photos and videos and automatically creates a finished video piece, complete with music and effects.

    Snap Spectacles

    Messaging app Snapchat sells a pair of sunglasses with a built-in camera that can record short videos with the push of a button. Snap Inc. says the product, called Spectacles, is designed to "catch the moment, without taking you out of it."

    The glasses can record short video clips that can be shared with Snapchat users. Snap Inc. has started selling its Spectacles sunglasses online in the United States.

    Apple iPhone X

    Apple's new iPhone X is being launched with its new Face ID system that it says will unlock the phone just by having the user look at it. This replaces the Touch ID on previous ones that used a fingerprint to unlock the phone.

    Apple says the system works by projecting more than 30,000 dots on the face to create a kind of map. Apple says its facial recognition is even secure enough to allow payments through its Apple Pay service.

    "If they hated me they didn't talk to me about it," says a young German manager at a media firm in Frankfurt. Still, he says it was noticeable that when an employee 20 years older than him thanked him for buying lunch he had to swallow twice before adding the word "boss".

    Older workers sometimes envy being managed by a younger colleague. Precocious (老成的) youngsters, too, can feel awkward about bossing their elders around. But in Germany a shortage of skilled workers means that such situations are becoming even more common.

    The country's population is projected to shrink. As more Germans retire, fewer youngsters are entering the work-place to replace them. As a share of the working population the number of 15-to-24-year-olds has fallen by ten percent since the 1980s, says the German Federal Employment Agency. Firms competing to hire young talent have to promote them earlier as a result. A paper by professors at the university of Cambridge and WHU, a German business school, to be published in the Journal of Organizational Behavior, suggests this could be a problem.

    As in many countries, German work-places are legally obliged to overlook age when deciding whom to promote. Yet according to Jochen Menges, one of the authors, when an ordinary worker leap-frogs a more experienced one it can leave the latter with feelings of "anger, fear and disgust." People tend to judge their own standing by the success of their peers, and to see failure in being bossed about by someone younger. The relationship between feelings of anxiety and the age of the boss is clear, according to Mr Menges. A manager who is younger by one year is somewhat unsettling; a gap of 20 years is far more discouraging.

    German firms certainly shouldn't return to a system in which age equals to rank. But young people tend to be sensitive about managing upwards. And older workers should be encouraged to see the bright side of learning new skills. Daimler, a big German car firm, says it promotes age- mixed teams, so that knowledge can be transferred between generations. It also supports young managers by asking retired employees to provide temporary support.

 Last week, my younger brother visited me for five days. To ensure I could spend as much time with him as possible, I worked extra hard during the weekend before he arrived.

 It amazed me how much I could accomplish when I had a strong motivation to be efficient.

 During the week, I put in a couple of hours in the mornings to handle pressing issues and then spent the afternoons and evenings going out with him. Once again, I was surprised to realize just how much free time was available to me if I consciously chose to be more effective while working.

 This made me think of Parkinson's Law: Work expands to fill the time available for its completion.

 I realized then that I'd given myself more time than necessary for work, and as a result, I ended up spending a lot of time delaying needlessly and entertaining myself online.

 How might things change for me, I wondered, if I chose to commit to more social and recreational activities, made them priorities and was motivated to finish work quicker?

 I realize not everyone has flexible work schedules, but I believe we could all create more time for ourselves if we were motivated to cut out the choices that don't match our strongest desires and intentions. Maybe it's being absent-minded in front of the TV or searching the web.

 I believe what English musician John Lennon said is true: Time that you enjoyed wasting was not wasted.1 don't think there's anything wrong with using technology if we've consciously chosen to do it.

 However, we owe it to ourselves to get out in the world and explore different possibilities—to be playful, curious, engaged and just to be.

 Perhaps it would be easier to do that if we asked ourselves: How can I be more effective? Can I minimize what I am currently doing? How can I start using the time I've created in a way that will excite and inspire me?