As the audience got larger, thetechnology got better. Television sets became more reliable through the 1960s. The reception (接收效果)improved. The picture improved. The major networks started broadcastingprograms in color.

    Even greater improvements were comingaccording to Sanford Brown, who wrote an article for the Post in 1967.Surprisingly, just about every prediction he made in the article became areality. For example: All sets in the not-distant future will be colorinstruments. He also predicted that TV sets would become smaller, simpler, morereliable and less expensive and may forever put the TV repairman out of work.Smaller sets do not, of course, mean smaller screens. TV engineers expectscreens to get much bigger. However, today's 3-D TV is even farther away, if it's coming at all. There is some doubt whether the public would be eager topay for it, in view of people's cold reception given to 3-D movies.

    But the technology with the greatestpotential, according to Brown, was cable television (有线电视), whichwas still in its early stages then. As he predicted, the future of cabletelevision was highly interactive (互动的). It wasn't cable television that gaveAmericans their electronic connection to the world, however. It was theInternet. He even foresaw the future office: using picture phones, big-screentelevisions for conferences, and computers providing information at the touchof a button.

    Brown ever said, “The future oftelevision is no longer a question of what we can invent. It's a question ofwhat we want.”

                                                                                                  Sleep Struggle

     One in every five young people has a sleep problem, so you're not alone. Getting enough sleep has become as important as eating vegetables and exercising regularly. It's very important for your body.

     Most young people only get seven hours of sleep each night, when they actually need nine hours. And making up for lost sleep during the week by sleeping on weekends doesn't really work. In fact, sleeping late on weekends may actually do you more harm than good, if you have sleep problems.

     What happens if you don't get enough sleep? If your sleep problem continues for a few nights, you could suffer serious problems. Lack of sleep can affect learning and memory. Worse, if your sleep difficulties last a long time, that could lead to anxiety (焦虑). Therefore, you've got to have some healthy sleep habits. Below are some suggestions:

     •Go to bed at the same time—including weekends, if possible.

     •Wake up around the same time every morning. When you sleep late just one morning during the week, it may disturb your body clock. This will make it hard for you to sleep that night.

     •Do something relaxing before going to bed.

     •Exercise during the day. Don't exercise right before going to bed.

     •Avoid drinking. Alcohol (酒精) makes you excited. This prevents you from falling asleep or wakes you up during the night.

     •Don't smoke. Smoking is always bad for the body. Smoking before bedtime keeps you awake.

     If trying these tips over a couple of weeks does not help you, speak to your doctor. Do not take any medicine without first asking your doctor. Many of them have strong side effects.

    If you live in the U.S., you're probably used to throwing banana peel into the trash. But people in other countries, including India, have been taking advantages of their nutritional benefits for many years.

    While the flesh of a banana is soft and sweet, the skin is thick, hard and slightly bitter. To eat the peel, you can fry, bake, or boil it for at least 10 minutes. Also, the riper bananas get, the thinner and sweeter banana peel will become. That's because of a natural plant hormone(激素) called ethylene(乙烯) that fruits release as they ripen. Ethylene interacts with the sugars and fiber in the banana skin, changing complex sugars into simple sugars and breaking down pectin, a form of fiber in bananas that keeps them stiff. That's why the older your banana is, the flimsier(不结实的) it feels.

    The sweet flesh of a medium-sized banana contains great percentages of your daily recommended intake of various nutrients, such as:

·12% of your daily fiber, which helps with digestion and may help lower your risk of diabetes(糖尿病)

·17% of your vitamin C, which is important for your immune system as well as your growth

·20% of your vitamin B6, which aids the body's ability to turn food into energy

·12% of your potassium, which helps with the development of cells, tissues, and organs throughout the body

    If you eat the skin along with the flesh, you will get an even bigger increase in these same nutrients.

    Eating the peel is not only good for your body but also better for the earth. The average American ate 11.4 pounds of bananas in 2014. Since a medium-sized banana weighs about 0.3 pounds, that equates to about 38 bananas per person, or about 12 billion for the whole of the U.S. And since most of us throw away the peel, that also means a lot of organic waste.

    In 2006, a New York City English teacher named Ms Lockwood asked her students to write to their favorite authors and persuade them to visit the school. Five of those pupils chose novelist Kurt Vonnegut who was the author of 14 novels. He was the only author to reply. Though he never made the trip to their school, Vonnegut responded to the students with the following letter.

    Dear Xavier High School, Billy, Sally, Jonny, Maurer and Kathy,

    I thank you for your friendly letters. You sure know how to cheer up an old man (84) in his sunset years. I don't make public appearances anymore. I'd like to advise you to do the following things: Practice any art—music, singing, dancing, acting, drawing, painting, poetry, fiction, essays—no matter how well or badly, not to get money and fame, but to experience becoming, to find out what's inside you, to make your soul grow.

    Seriously! I mean starting right now, do art and do it for the rest of your lives. Draw a funny or nice picture of Ms Lockwood and give it to her. Dance home after school, and sing in the shower, and on and on. Pretend that you're Count Dracula. Here's an assignment for tonight, and I hope Ms Lockwood will not let you pass the test if you don't do it.

    Write a six-line poem about anything. Make it good as you possibly can. But don't tell anybody what you're doing. Don't show it or recite it to anybody, not even your girlfriend or parents, or Ms Lockwood. OK? Tear it up into pieces and throw them into dustbins. You will find that you have already been gloriously rewarded for your poem. You have experienced becoming, learnt a lot more about what's inside you, and you have made your soul grow.

      God bless you all.

                                                                                                                                                                          Kurt Vonnegut

    China will soon issue licenses for the commercialization(商业化) of 5G, as the country has already established(建立)a competitive advantage in the superfast wireless technology.

    The Ministry of Industry and Information Technology said 5G is entering a critical period of commercial deployment(部署)globally and China's 5G industry has established a competitive advantage through a combination of innovation(创新) and open cooperation.

    Many foreign companies, including Nokia and Intel, have participated in China's technical 5G tests. These foreign companies have already participated in three phases of tests organized by China to get their 5G products and solutions ready for commercial use in the country.

    "With joint efforts of all parties, China has built a foundation for commercialization of 5G," the ministry said, adding it will issue commercial 5G licenses in the near future, a clear sign China will soon officially enter the first year of 5G.

    China's big three telecom carriers are forecast to spend 900 billion to 1.5 trillion yuan ($134 billion to $223 billion) in total on 5G network construction from 2020 to 2025, according to a report from the China Academy of Information and Communications Technology. In comparison, Chinese telecom operators spent 720 billion yuan on 4G network construction from 2014 to 2018.

    In 2019, China Mobile plans to build 30,000 to 50,000 5G base stations this year, while China Telecom is looking to have 20,000.

    The fiddler crab (蟹) is a living clock. It indicates the time of day by the colour of its skin, which is dark by day and pale by night. The crabs changing colour follows a regular twenty-four hour plan that exactly matches the daily rhythm (节奏) of the sun.

    Does the crab actually keep time, or does its skin simply answer to the sun's rays, changing colour according to the amount of light strikes it? To find out, biologists kept crabs in a dark room for two months. Even without daylight, the crab's skin colour continued to change exactly on time.

    This characteristic(特性) probably developed gradually in answer to the daily rising and setting of the sun, to help protect the crab from sunlight and enemies. After millions of years it has become completely regulated (受控制) inside the living body of the crab.

    The biologists noticed that once each day the colour of the fiddler crab is especially dark, and that each day this happens fifty minutes later than on the day before. From this they discovered that each crab follows not only the rhythm of the sun but also that of the tides (潮水). The crabs period of greatest darkening is exactly the time of low tide on the beach where it was cought!