When thinking about placing a human being in space, one of the most important questions was how to design special clothing needed to protect a person from the dangers of the space environment. The cold of space will freeze skin in a short time. The fierce heat of the sun can cause serious burns. The lack of atmosphere can cause gases in the body to expand(扩大) and even burst. With no oxygen to breathe, a human being will die in only a few moments. Radiation from the sun is another risk in space. So is damage from small pieces of rock and objects like meteoroids (陨石).

    In 1933, an American flyer, Wiley Post, designed one of the first successful devices to protect a pilot at extreme heights. It was a large device that looked like a can surrounded the pilot's head. Astronauts in the American space agency (NASA) flew the first American space flights in the early 1960s. The clothing was similar to that invented by Wiley Post.

    Today, astronauts wear very different protective clothing. It lets them move, do useful tasks, and stay outside their spacecraft in comfort and safety for several hours. The spacesuit is called the shuttle extravehicular mobility unit or EMU. It was designed to endure longer and to permit more movement than earlier spacesuits.

    The EMU has a number of parts that an astronaut can link together by using only one hand, which makes it possible for each astronaut to select the parts that fit correctly.

    Nowadays, NASA scientists are also considering the kind of spacesuits that would be needed for exploration on the planet Mars. Because of the gravity on Mars, spacesuits may have to be designed to be lighter than suits used in orbit or on the moon. The equipment may also have to protect astronauts from dust carried in the winds on Mars. And, they must be easy to repair and keep clean during a longer flight to and from the red planet.

    Are you looking for some great beach movies? If you are, here are some beach movies that you are advised to watch.

    Blue Hawaii (1961)

    The first of Elvis Presley's Hawaiian three beach movies puts him into a setting(背景) as an army man who returns home for some surfing. Mom Angela Land sbury wants Presley to get a real job, but he's all about touring the island. Relax, Mom. Time for some wonderful parties!

    Beach Blanket Bingo (1965)

    The most famous of the “beach party” film of the 1960s stars Frankie Avalon and Annette Funicello. This movie is all about how fun it is to be a teenager, especially if you're at a party on the beach. Sunny, silly and energetic! You might find yourself laughing at the story and being happy after watching it.

    Six Days Seven Nights (1998)

    Anne Heche stars a woman unhappily engaged (订婚) to Frank Martin. On a vacation, she finds herself on a plane piloted by a sad man called Quinn Harris. They hate each other, which gets even more annoying once they two find themselves being alone on an island with no people. What better setting to fall in love?

Teen Beach Movie (2013)

    The Disney Channel remade the beach party movie in 2013 and brought us a new series of teens-dancing-on-the-beach movies. Ross Lynch is a kid suddenly thrown into a actual teen beach movie by a magic wave! Time to dress up fifties-style and sing tunes (曲调) like Surf Crazy and Cruisin for a Bruisin. In the end, the kids return to the real world. These are the movies to watch if you love happy endings.

    In this Pennsylvania city, Pittsburgh is shrinking but getting wealthier. Since 2000, its population has declined by 95,000 while its income per capita (人均) has shot up 24 percent. The trend is taking hold in many other cities, like Buffalo in New York, Providence in Rhode Island and New Orleans.

    Some of these areas have created more high-paying jobs in energy, health care or education. Others have managed to reshape their manufacturing (制造业) for a new economy. Higher-paying jobs have a greater effect because they create demand for additional services. “The story in Pittsburgh is very positive, and other areas are looking at it as an example of the transformation that might be possible,” said Guhan Venkatu, who wrote an economic history of the area called “Rust and Renewal” for the Federal Reserve Bank of Cleveland.

    Carnegie Mellon University and the University of Pittsburgh have helped bring tech jobs and innovation (革新) to the area by sponsoring tech centers that help graduates start companies without moving to Silicon Valley or San Francisco. This has helped keep Pittsburgh's educated young population growing even as the entire population in the city has dropped.

    Pittsburgh has more STEM (science, technology, engineering and math) jobs than other shrinking cities, about 80,000 or 7% of all jobs. STEM jobs add productivity and income growth to the area. Manufacturers of high-tech medical equipment in the Pittsburgh area also have doubled employment in the last 10 years.

    However, some experts question whether growing income per capita can really make up for a declining population. According to Patrick Adler, a researcher at the University of Toronto, population loss does matter if it means lower-skilled workers have fled because of a lack of opportunity. What's more, high-paying jobs in education and health care can disappear if the population declines too greatly. So it'd be wise to find ways to increase the population.

    One family, which moved from Japan and settled at the turn of the century near San Francisco, had built a business in which they grew roses and trucked them into San Francisco three mornings a week.

    The other family also marketed roses. For almost four decades the two families were neighbors, and the sons took over the farms, but then on December 7, 1941, Japan attacked Pearl Harbor. Although the rest of the family members were American, the father of the Japanese family had never been naturalized. As they planned to leave the country, his neighbor made it clear that, if necessary, he would look after his friend's nursery (花圃). It was something each family had learned in church-Love the neighbor as themselves. "You would do the same for us," he told his Japanese friend.

    It was not long before the Japanese family was transported to a poor landscape in Canada. A full year went by. Then two. Then three. While the Japanese neighbors were in Canada, their friends worked in the greenhouses. Sometimes the father's work could stretch to 16 and 17 hours. And then one day, when the war in Europe had ended, the Japanese family packed up and boarded a train. They were going home.

    What would they find? The family was met at the train station by their neighbors, and when they got to their home, the whole Japanese family were shocked. There was the nursery, complete, clean and shining in the sunlight, neat, prosperous and healthy. And the house was just as clean and welcoming as the nursery. And there on the dining room ground was one perfect red (玫瑰花蕾), just waiting to unfold-the gift of one neighbor to another.

    Humans are social animals. They live in groups all over the world. As these groups of people live apart from other groups, over the years and centuries they develop their own habits and ideas, which are different from other cultures. One important particular side of every culture is how its people deal with time.

    Time is not very important in nonindustrial (非工业的) societies. The Nuer people of East Africa, for example, do not even have a word TIME that is in agreement with the abstract thing we call time. The daily lives of the people of such nonindustrial societies are likely to be patterned around their physical needs and natural events rather than around a time schedule (时间表) based on the clock. They cook and eat when they are hungry and sleep when the sun goes down. They plant crops during the growing seasons and harvest them when the crops are ripe. They measure time not by a clock or calendar, but by saying that an event takes place before or after some other event. Frequently such a society measures days in terms of "sleeps" or longer periods in terms of "moons". Some cultures, such as the Eskimos of Greenland measure seasons according to the migration of certain animals.

    Some cultures which do not have a written language or keep written records have developed interesting ways of "telling time". For example, when several Australian aborigines want to plan an event for a future time, one of them places a stone on a cliff or in a tree. Each day the angle of the sun changes slightly. In a few days, the rays of the sun strike the stone in a certain way. When this happens, the people see that the agreed-upon time has arrived and the event can take place.

    In contrast (成对比), exactly correct measurement of time is very important in modern, industrialized societies.

    This is because industrialized societies require the helpful efforts of many people in order to work. For a factory to work efficiently (well, quickly and without waste), for example, all of the workers must work at the same time. Therefore, they must know what time to start work in the morning and what time they may go home in the afternoon. Passengers must know the exact time that an airplane will arrive or depart. Students and teachers need to know when a class starts and ends. Stores must open on time in order to serve their customers. Complicated (复杂的) societies need clocks and calendars. Thus, we can see that if each person worked according to his or her own schedule, a complicated society could hardly work at all.