Hetty Robinson learnt all about money when very young. As a child, she read the financial pages of the newspaper to her rich father. Her father died when Hetty was 30, and she inherited $1 million. When she herself died in 1916, she left almost $100 million to her two children.

    Hetty made her money on the New York stock(股票) exchange. She was a financial genius. She made money so easily that people called her the Witch of Wall Street. But although she was one of the richest women in the world, she counted every cent and spent as little as possible. She didn't own a house, because she didn't want to pay taxes. So she and her children lived in cheap hotels. She spent almost nothing on clothes, and always wore the same long black dress. She washed it herself, but to save soap she only washed the bottom of the dress, where it touched the ground. Other people had their own offices, but Hetty used a desk in the bank where she kept her money, because it didn't cost anything. She sat in the bank and ate her sandwiches while she bought and sold stocks and shares. If the bank complained, she just moved all her money to another bank.

    Hetty's family paid the price for her meanness. When she was 33 she married a millionaire, Edward Green, and they had two children. But Green lost all his money, so she left him. When her son, Ned, injured his knee, Hetty didn't want to pay for a doctor, so she took him to a free hospital for poor people. Unfortunately the doctor knew Hetty was rich and he asked for money. Hetty refused and took the boy away. His leg got worse and two years later doctors removed it.

    But eventually Ned got his revenge(报复). At the age of 81, Hetty had an argument with a shop assistant about the price of a bottle of milk. She became so angry that she had a heart attack and died. So Hetty's meanness finally killed her. Ned inherited half his mother's fortune, and he spent it all on parties, holidays and expensive jewellery.

    Here is your best chance to travel around the UK in 2012: More than 200 B&Bs（bed & breakfast）across England, Scotland, Wales and Northern Ireland are selected to offer you amazing services for your stay at their lowest prices! Don't miss it. Just collect the vouchers（活动券）in our B&B Daily printed from 01/04/2012 to 07/04/2012 and book the stays for your travel following the terms and conditions below:

    The offer includes a room for the night and a breakfast the next morning.

The offer is of two kinds: ￡20 per room, valid（有效的）during stay period of 02/04/2012—31/05/2012 and then again 01/09/2012—31/10/2012；￡35 per room, per night, valid during stay period of 01/06/2012—31/08/2012.

    The offer is valid for a basic twin or double room only.

    The stay must be booked directly with the chosen B&Bs before 28/04/2012.

    Each voucher can only be used by the holder to book one room for one night.

    If voucher holders book either the ￡20 or ￡35 per room per night, any additional services such as lunch, evening meal or activities may require an extra charge. But these are not required in order to take up the offer. Please check directly with your chosen B&Bs to see what extra services are available.

    Vouchers must be presented on arrival. If no vouchers are presented, the     B&Bs may reserve（保留）the right to charge at full price for every night of stay.

    Vouchers may not be used together with any other offer.

    The voucher holders must pay for the stay in full at the time of booking. Additional ￡10 may be paid to confirm（确认）the booking and will be returned on arrival.

    The B&Bs reserve the right to refuse voucher holders' bookings for people under the age of 18.

    During World War Ⅱ, William Powell served in Europe as a solider in the US Army. Golf was his hobby. He played at some of the most popular courses in Scotland. However, upon his return home, William Powell was discouraged to find that he wasn't allowed to play golf at local courses because he was an African American. William Powell took a unique approach to solving his problem. He built his own golf course.

    William Powell began the construction of the Clearview Golf Course in 1946. He moved rocks and spread grass seeds to build a golf course in Canton, Ohio. He convinced two African American doctors to invest in the course and continued to build it for the next year and a half. William Powell built it without the help of a designer. He did it while working at night as a security guard. In 1948, the Clearview Golf Course opened, and the business is still popular today.

    In 1967, William Powell's daughter, Renee, became a professional golfer on the Ladies Professional Golf Association (LPGA) tour. Now, she serves as Head Professional at her father's golf course. In 2001, the Clearview Golf Course was one of the 15 golf courses listed on the National Register of Historic Places. It's the only course owned, built, designed and run by African Americans. The Clearview Golf Course not only serves as a challenge to experienced golfers, but also provides an enjoyable round for those players who are new to the game.

    In 2009, the Professional Golfers' Association of America (PGA of America) honored William Powell with a Distinguished Service Award. William Powell, 92 years old, accepted the award politely. "I have had so many special things happen to me, because the golf sees no color," he said.

    My husband and I recently went to Disney World with our three children. We had a wonderful time. Besides, I experienced something that left a deep impression on me.

    Our children were excited about the attraction where children could drive the cars. They were so delighted that I decided to stand beside the track to get pictures of everyone as they drove past on the track.

    As I waited for them to drive by, I noticed a car with a father and his son who was about 7 years old. They rolled down the hill at the beginning, but suddenly the car stopped. The young driver looked nervous, "I can't do it." His father quietly said, "Yes, you can."

    "No. I can't!"

    "Yes, you can, son."

    The little guy was almost in tears, "I can't!" With deep patience, the father said, "Son, you can do this. I'm going to help you." A moment later, with the father helping his son, the two went smoothly (顺利地) on their way down the track.

    The scene brought tears to my eyes and it reminded (使想起) me of my dear father. Just like that little boy's dad, my father used to say the same words to me. Every time things got hard or when I experienced setbacks along the way, he would say, "Michelle, you can do this. I'm going to help you."

    Time and time again the words greatly encouraged me on the journey. I'm aware that I can't do things under my own power, but the words "Yes, you can" come beside me and give me wisdom and strength. As I benefited (受益) a lot from them, I often tell my children never to say "I can't" easily when they meet something difficult.

    You can't see your sleeping pets brain waves, but its behavior can tell you when your cat might be dreaming. If you watch closely, you'll see that as she falls asleep, her breathing becomes slow and regular with her body still. She has entered the first stage of sleep, called slow-wave sleep. After about 15 minutes you'll notice a change in her breathing. Her eyes move under her closed lids, her paws twitch (抽动) and she flicks (尤指用手指或手快速地轻抚) an ear. She has entered dreaming. Although she twitches and makes little grunting (嘟嘟) noises, messages from her brain to the large muscles in her legs are blocked, so she can't run about. She is in a state of "sleep paralysis (麻痹)".

    Michel Jouvet, a French scientist, interrupted their sleep paralysis. Even though they were completely asleep, the dreaming cats began to run for balls that Jouvet couldn't see and arched (弓起) their backs at unseen enemies. He figures he was watching them act out their dreams! Obviously, the dreaming cats seemed to be practising important cat skills: following, pouncing (猛扑), and fighting.

    In another study, Matt Wilson recorded rats brain waves while they learned mazes (迷宫). One day, he left the brain-wave-recording machine on while the rats fell asleep. The pattern of brain waves in the sleeping rats matched the pattern from the maze so closely that Wilson could figure out exactly which part of the maze each rat was dreaming about!

    Many researchers now think that in both people and animals, one purpose of dreams is to practise important skills and figure out recent caning. This may explain why so many people dream about fighting and escaping, skills that were probably important to our ancestors, and why dreaming affects our ability to learn.

    Do all animals dream? From looking at the brain waves of sleeping animals. How often animals dream seems to be tied to body size. Cats dream about every 15 minutes, mice every 9 minutes, and elephants every 2 hours. And though cows and horses usually sleep standing up, they only dream when lying down.

    Microsoft announced this week that its facial-recognition system is now more accurate in identifying people of color, touting (吹嘘)its progress at tackling one of the technology's biggest biases (偏见).

    But critics, citing Microsoft's work with Immigration and Customs Enforcement, quickly seized on how that improved technology might be used. The agency contracts with Microsoft for cloud-computing tools that the tech giant says is largely limited to office work but can also include face recognition.

    Columbia University professor Alondra Nelson tweeted, "We must stop confusing 'inclusion' in more 'diverse' surveillance (监管)systems with justice and equality."

    Facial-recognition systems more often misidentify people of color because of a long-running data problem: The massive sets of facial images they train on skew heavily toward white men. A Massachusetts Institute of Technology study this year of the face-recognition systems designed by Microsoft, IBM and the China-based Face++ found that facial-recognition systems consistently giving the wrong gender for famous women of color including Oprah Winfrey, Serena Williams, Michelle Obama and Shirley Chisholm, the first black female member of Congress.

    The companies have responded in recent months by pouring many more photos into the mix, hoping to train the systems to better tell the differences among more than just white faces. IBM said Wednesday it used 1 million facial images, taken from the photo-sharing site Flickr, to build the "world's largest facial data-set" which it will release publicly for other companies to use.

    IBM and Microsoft say that allowed its systems to recognize gender and skin tone with much more precision. Microsoft said its improved system reduced the error rates for darker-skinned men and women by "up to 20 times," and reduced error rates for all women by nine times.

    Those improvements were heralded(宣布)by some for taking aim at the prejudices in a rapidly spreading technology, including potentially reducing the kinds of false positives that could lead police officers misidentify a criminal suspect.

    But others suggested that the technology's increasing accuracy could also make it more marketable. The system should be accurate, "but that's just the beginning, not the end, of their ethical obligation," said David Robinson, managing director of the think tank Upturn.

    At the center of that debate is Microsoft, whose multimillion-dollar contracts with ICE came under fire amid the agency's separation of migrant parents and children at the Mexican border.

    In an open letter to Microsoft chief executive Satya Nadella urging the company to cancel that contract, Microsoft workers pointed to a company blog post in January that said Azure Government would help ICE "accelerate recognition and identification." "We believe that Microsoft must take an ethical stand, and put children and families above profits," the letter said.

    A Microsoft spokesman, pointing to a statement last week from Nadella, said the company's "current cloud engagement" with ICE supports relatively anodyne(温和的)office work such as "mail, calendar, massaging and document management workloads." The company said in a statement that its facial-recognition improvements are "part of our going work to address the industry-wide and societal issues on bias."

    Criticism of face recognition will probably expand as the technology finds its way into more arenas, including airports, stores and schools. The Orlando police department said this week that it would not renew its use of Amazon. com's Rekognition system.

    Companies "have to acknowledge their moral involvement in the downstream use of their technology,"

    Robinson said. "The impulse is that they're going to put a product out there and wash their hands of the consequences. That's unacceptable."