A great white shark in a California aquarium attacked two soupfin sharks(翅鲨), causing their deaths. The attack was not a natural action for food, but a kind of response when the two sharks swam too close to the great white. The great white didn't attacked other fellows, but the officials had to move other soupfin sharks to another tank(贮水池)for their safety.

    These attacks had given rise to calls for the freedom of the 88-pound, 5-foot-3- inch shark. The aquarium housed the shark in a huge tank. However, according to experts, the tank was not big enough for the shark. Its nose was bloody from striking the glass of the aquarium. Great white sharks in the wild had a big amount of migration, sometimes traveling 50 miles a day. Because the shark was still young, there was possibility of his growing. As it grows, it can became more troubled in the limited space.

    Aquarium officials said that keeping the shark in the aquarium allowed them to study their behavior that they cannot study with free great white sharks. When they studied behavioral patterns, scientists believed that they can help great white sharks in the wild.

    Since the shark had been on display, the number of people who visited aquarium increased greatly. The one-year-old shark was the longest surviving great white living here. It had been at the Monterey Bay Aquarium for six months. Other great whites did not survive for longer than 16 days in the aquarium.

    Natural selection is the process by which one type of animal within a species thrives because of certain characteristics that make it more likely to live than others in its group. The history of the peppered moth（灰蛾）is an example of the natural selection process.

    In 19th century England, certain types of peppered moths were able to better blend（融合）into their surroundings. During that time period, great changes were happening in Great Britain. The Industrial Revolution was part of this change, and with it came air pollution. Natural selection often takes hundred or even thousands of years to occur. For the peppered moth, this process occurred comparatively quickly.

    At the beginning of the Industrial Age, most peppered moths in England were light-colored and covered with black markings, although a few moths had dark-colored wings. Because the light-colored moths blended into the light-colored bark on the trees, they could not be easily seen by birds that would eat them. As the air grew more polluted, however, tree trunks became covered with soot（烟煤）and became darker. The light-colored moths became easy for birds to see against the dark tree trunks. Since the dark-colored moths now had the advantage, their numbers grew. Within 50 years, the peppered moth went from being mostly light-colored to being mostly dark-colored.

    In the 20th century, the air cleared up, and the peppered moth population changed again. As tree trunks lighted due to less soot in the air, light-colored moths once again had an advantage. Their numbers increased as soot levels declined. Depending on their environment, the coloration of the moths helped them to be “naturally selected” to survive.

    Many people prefer eating out instead of cooking at home. A change appears to be taking place, though, and millennials are leading the way. According to one survey, more young people are starting to cook at home for three basic reasons: They can save money, eat healthy and waste less food.

    Popular TV chefs are also getting millennials excited about learning some basic cooking skills. Many millennials view cooking as a form of entertainment and self-expression. They proudly post pictures of their cooking creations on Facebook or Instagram, and invite friends over to share the cooking experience.

    Many millennials have also found ways to avoid wasting food. After roasting a chicken, they put the leftover bones in their freezer instead of the garbage can. Later, they use the bones to make chicken stock which is an important ingredient in many dishes.

    They also hate throwing out fruit that's too old. To avoid that situation, they bake ripe fruit like berries and bananas for 15 minutes at 175 degrees C. Then they freeze it overnight. After that, they place the fruit in plastic bags and store it their freezer for later use.

    Now any millennials only eat at restaurants that have excellent food-waste policies. These servants use every part of the vegetables they buy, including their stems and roots, in dishes. They also use beef, chicken and pork bones to make their own stock.

    Millennials also reduce food waste by only buying what they require. Before going to a market, they write down what they need and don't buy anything else. They say they won't purchase more food than they can consume.

    Anyone who cares about what schools and colleges teach and how their students learn will be interested in the memoir (回忆录) of Ralph W. Tyler, who is one of the most famous men in American education.

    Born in Chicago in 1902, brought up and schooled in Nebraska, the 19-year-old college graduate Ralph Tyler became hooked on teaching while teaching as a science teacher in South Dakota and changed his major from medicine to education.

    Graduate work at the University of Chicago found him connected with honorable educators Charles Judd and W. W. Charters, whose ideas of teaching and testing had an effect on his later work. In 1927, he became a teacher of Ohio State University where he further developed a new method of testing.

    Tyler became well-known nationally in 1938, when he carried his work with the Eight-Year Study from Ohio State University to the University of Chicago at the invitation of Robed Hutchins.

    Tyler was the first director of the Center for Advanced Study in the Behavioral Sciences at Stanford, a position he held for fourteen years. There, he firmly believed that researchers should be free to seek an independent spirit in their work.

    Although Tyler officially retired (退休) in 1967, he never actually retired. He served on a long list of educational organizations in the United States and abroad. Even in his 80s he traveled across the country to advise teachers and management people on how to set objectives (目标) that develop the best teaching and learning within their schools.

    LONDON Tuesday April 11—Dustin Hoffman fan Pamela Crack got the shock of her life when the movie star telephoned her as she was doing her housework.Crack, 58, said she was "flabbergasted" when she picked up the phone and heard the star at the other end.

    "It's not every day you get a Hollywood superstar phoning you when you're doing the housework," Crack told the Sun."It was a moment I'll never forget."

    Hoffman was in the back of a London taxi driven by Crack's husband, Dave, when he made the call after being told Pamela was a fan. Dave Crack later became the star of Hoffman's speech at the Bafta award ceremony Sunday, where the 62-year-old American actor presented the Best Film award.

    "He said to give him a mention," Hoffman told the audience to a burst of laughter. "Cheers Dave."Taxi driver Crack said the Hollywood star was a joy to drive from the moment he got into the taxi eating a cheese and tomato sandwich.

    "I said 'You're that Dustin Hoffman, aren't you?' and he said, 'Yes I am—would you like a sandwich?' I was a bit surprised but I took a sandwich from him and ate it hungrily."

A surprising new research from Auckland University of Technology (AUT), New Zealand contradicts the commonly held view that surfers are folks only focused on their own fun. Instead, they often play an important role in saving lives. The research reveals that these thrill seekers selflessly save people they see struggling in the ocean as swimmers or after boating incidents, and so actually reduce deaths from drowning (溺水), playing a key role in making beaches safer. 

According to the World Health Organization, an estimated 236,000 people drown worldwide each year, with drowning the third leading cause of unintentional death. 

However, according to a survey, at the heart of the research, life-saving acts of heroism by surfers who save others in difficulty in the ocean waters around them, are surprisingly common. In fact, based on the sample of 418 surfers, respondents reportedly rescue an average of three people drowning or struggling in the water over the course of their lives, and some even report taking part in 10 to 20 rescues. This makes surfers the under-recognized guardians of the beach rather than the self-centered images shown in movies like Fast Times at Ridgemont High, or Point Break. 

In addition, the survey found that in almost 90 percent of rescues, people aided by the responding surfers required no further treatment after the incident, making their help unlikely to be reported and so recorded, As one of the survey's co-authors Jamie Mead says, "We need to get surfers the recognition they deserve and do more research to accurately quantify (用数量表述) how many rescues they're actually doing."

Since this research was published, there has been a growing interest in the training of surfers in life-saving skills. Sonia Keeper, an experienced surfer and instructor, explains that the insights provided by the survey have motivated surfing organizations to expand their reach and connect with an even broader community of surfers. "If life-saving skills are rolled out (正式推出) to the broader coastal surfer communities around the world, this preparation can help ensure that a good day at the beach doesn't turn into a sad one," she adds.