Most of the people who appear most often and most gloriously in the history books are great conquerors and generals and soldiers, whereas the people who really helped civilization forward are often never mentioned at all. We do not know who first set a broken leg, or launched a seaworthy boat, or calculated the length of the year, or manured(施肥)a field; but we know all about the killers and destroyers. People think a great deal of them, so much so that on all the highest pillars (纪念柱) in the great cities of the world you will find the figure of a conqueror or a general or a soldier. And I think most people believe that the greatest countries are those that have beaten in battle the greatest number of other countries and ruled over them as conquerors. It is just possible they are, but they are not the most civilized.

    Animals fight; so do savages (野蛮人); hence to be good at fighting is to be good in the way in which an animal or a savage is good, but it is not to be civilized. Even being good at getting other people to fight for you and telling them how to do it most efficiently －this, after all, is what conquerors and generals have done －is not being civilized. People fight to settle quarrels. Fighting means killing, and civilized peoples ought to be able to find some way of settling their disputes other than by seeing which side can kill off the greater number of the other side, and then saying that that side which has killed most has won. And it not only has won, but, because it has won, has been in the right. For that is what going to war means; it means saying that might is right.

    That is what the story of mankind has on the whole been like. Even our own age has fought the two greatest wars in history, in which millions of people were killed or disabled. And while today it is true that people do not fight and kill each other in the streets －while, that is to say, we have got to the stage of keeping the rules and behaving properly to each other in daily life － nations and countries have not learnt to do this yet, and still behave like savages.

    We walked in so quietly that the nurse at the desk didn't even lift（抬起）her eyes from the book.Mum pointed at a big chair by the door and I knew she wanted me to sit down.While I watched,mouth open in surprise.Mum took off her hat and coat and gave them to me to hold.She walked quietly to the small room by the lift（电梯）and took out a wet mop（拖把）.She pushed the mop past the desk and as the nurse looked up.Mum nodded and said,"Very dirty floors."

“Yes.I'm glad they've finally decided to clean them,”the nurse answered.She looked at Mum strangely and said. “But aren't you working late?”

    Mum just pushed harder,each swipe of the mop taking her farther and farther down the hall.I watched until she was out of sight and the nurse had turned back to writing in the big book.

    After a along time Mum came back.Her eyes were shining.She quickly put the mop back and took my hand.As we turned to go out of the the door,Mum nodded politely to the nurse and said.“Thank you.”

    Outside,Mum told me, “Dagma is fine.No fever."

     “You see her,Mum?”

     “Of course.I told her about the hospital rules,and she will not expect us until tomorrow.Dad will stop worrying as well.It's a fine hospital.But the floors!A mop is no good.You need a brush."

    Travis is the manager of G&G where he is responsible for forty employees (雇员)and profits (利润) of over $2 million per year. He's never late to work. He does not get upset on the job. When one of his employees started crying after a customer screamed at her, Travis took her away. "Your working uniform is your shelter," he told her. "Nothing anyone says will ever hurt you. You will always be as strong as you want to be."

    Travis picked up that lecture in one of his G&G training courses, an education program that began on his first day and continues throughout an employee's occupation. The training has, Travis says, changed his life. G&G has taught him how to live, how to focus, how to get to work on time, and how to master his emotions (情绪). Most importantly, it taught him willpower.

    At the center of that education is an extreme focus on an all-important habit; willpower. Dozens of cases show that willpower is the single most important habit for a person's success.

     And the best way to strengthen willpower is to make it into a habit. "Sometimes it looks like people with great self-control aren't working hard—but that's because they've made it automatic," Angela Duckworth, one of the University of Pennsylvania researchers said. "Their willpower occurs without them having to think about it."

     The company spent millions of dollars developing programs of study to train employees on self-control. Managers wrote workbooks that serve as guides to how to make willpower a habit in workers' lives. Those courses arc, in part, why G&G has grown from a sleepy company into a large one with more than seventeen thousand stores and profits of more than $10 billion a year.

    The Renaissance marks a period of human awakening. In this article we are going to explore the inventions during this period which have helped change the life and progress of mankind.

    Clock

    The first mechanical clock was invented in the early 1300's. Galileo, an Italian scientist, discovered the pendulum (钟摆) around 1602. The pendulum greatly improved the movement of the hands of a clock. The average error with the pendulum varied only by seconds each day. Before this the error was from 10 to 15 minutes a day.

    Eyeglasses

    In the late thirteenth century, paintings first appeared with people wearing or holding eyeglasses. From these paintings, we know that eyeglasses were invented in Italy. Around 1300 the Venetian Glassmaker's Guild made it illegal for cheap glasses to be made. By 1352, eyeglasses were only worn by well-educated rich men. In 1456, the invention of the printing press allowed books to become widespread. Once people owned books, reading glasses began to be seen in the hands of common people. In 1623, the Spanish invented the first graded eyeglasses.

    Flush toilet (抽水马桶)

    Sir John Harrington, godson to Queen Elizabeth, made the first flush toilet for himself and his godmother in 1596. He was teased by his friends and never made another one.

    In 1775, Alexander Cummings reinvented the flush toilet more commonly called the water closet. Two years later in 1777, Samuel Prosser applied for and received a patent for it.

    Wallpaper

    In 1496, the first paper factory came into operation in England. English artists soon make wallpaper for decoration. For the next 200 years England was a large producer of wallpaper for Europe. Before wallpaper was invented, only wealthy people could afford to decorate the walls of their houses.

    Black Friday

    The day after Thanksgiving is the start of the holiday shopping season. Thanksgiving is always on a Thursday, so the day after is a Friday. This day has come to be known as Black Friday. It has been the busiest shopping day of the year since 2005.

    Most stores offer great deals on Black Friday. They open their doors in the small hours of the morning. They try to attract shoppers with big discounts. Some items like TVs are much cheaper than usual. Stores may even lose money on these items. They hope that shoppers will buy gifts for other people while they are in the store.

    Black Friday is a great time to get good deals. The problem is that there are not enough low-priced items to go around. Each store may only have a few. These items are in high demand. People stand in long lines to get such great deals. They may line up hours before a store opens. They may be hoping to get a low price on a TV or laptop, but not everyone who wants one will get one. Some people leave disappointed.

    The situation can be tense(紧张的). Some Black Friday events have been violent. Large, eager crowds have trampled(践踏) workers. Fights have broken out over toys or people cutting in line. People have shot one another over parking spots. But most Black Friday events are safe and fun. Still, if you plan on going, expect large crowds and a bit of pushing and shoving.

    So where does the name "Black Friday" come from? It was first used in Philadelphia in the 1950s. The police called this day Black Friday because of the heavy traffic it drew. In the 1960s, spread across the country. It seems that it is here to stay.

    Now people all over the country take part in the event known as Black Friday. It is even spreading to other parts of the world. Stores have held Black Friday events in the U.K., Australia, and Brazil since 2012. In Costa Rica Black Friday is known as "Viernes Negro." And in Mexico, stores offer an annual weekend of discounts. They call it "El Buen Fin," which means "the good weekend" in Spanish. I guess the language of savings is universal.

Plants may tell us when they're in trouble.Thirsty tomato and tobacco plants make clicking sounds,researchers have found.The sounds are ultrasonic (超声波的),meaning they are too high-pitched for human ears to hear.But when the sounds are transformed to lower pitches,they sound like popping bubbles (爆破的泡泡).Plants also make clicks when their stems (茎) are cut.

"It's not like the plants are screaming," says Lilach Hadany,an evolutionary biologist working at Tel Aviv University in Israel."Plants may not mean to make these noises.We've shown only that plants create informative sounds."

Hadany and her colleagues first heard the clicks when they set microphones next to plants on tables in a lab.The microphones caught some noises.But the researchers needed to make sure that the clicking was coming from the plants.So,the scientists placed plants inside soundproof boxes in the basement,far from the noise of the lab.There,microphones picked up ultrasonic pops from thirsty tomato plants.Though it was outside humans' hearing range,the clicking made by plants was about as loud as a normal conversation.

Cut tomato plants and dry or cut tobacco plants clicked,too.But plants that had enough water or hadn't been cut stayed mostly quiet.Wheat,corn and grapevines also made sounds when stressed out.

The researchers don't yet know why plants click.Bubbles forming and then popping inside plant tissues that transport water might make the noises.But however they happen,pops from crops could help farmers,the researchers suggest.Microphones,for example,could monitor fields or greenhouses to detect when plants need to be irrigated (灌溉).

Hadany wonders whether other plants and insects already tune into plant pops.Other studies have suggested that plants respond to sounds.And animals from pests (害虫),moths to mice can hear in the range of the ultrasonic clicks.Sounds made by plants could be heard from around five meters away.Hadany's team is now studying what the living things near the plants will do after hearing the sounds.