Elizabeth Blackwell was born in England in 1821, and moved to New York City when she was ten years old. One day she decided that she wanted to become a doctor. That was nearly impossible for a woman in the middle of the nineteenth century. After writing many letters asking for admission(录取) to medical schools, she was finally accepted by a doctor in Philadelphia. She was so determined that she taught school and gave music lessons to get money for the cost of schooling.

    In 1849, after graduation from medical school, she decided to further her education in Paris. She wanted to be a surgeon(外科医师), but a serious eye problem forced her to give up the idea.

    Upon returning to the United States, she found it difficult to start her own practice because she was a woman. By 1857 Elizabeth and her sister, also a doctor, along with another woman doctor, managed to open a new hospital, the first for women and children Besides being the first woman physician and founding her own hospital, she also set up the first medical school for women.

    Andrew Jackson has been sitting pretty on the $20 bill for 87 years. Is it time to bring some new blood to the banknote?

    The non-profit organization called Women on 20s is campaigning to put a woman's face on American money. Barbara Ortiz Howard, the company's founder, would like to see a woman on the $20 bill by 2020.That year marks the 100-year anniversary of the 19th Amendment to the United States Constitution, which gave women the right to vote.

    Howard got the idea when she realized that her daughter had no everyday reminders of famous women in history. She asked her friend Susan Ades Stone, a journalist, to join her cause. “Part of the aim is to educate as many people as possible about as many women as possible,” Ades says. “We want to see how many people we can reach.”

    American money values the successes of former presidents and founding fathers. Currently, there are only two women on money: Susan B. Anthony is the face of the rare dollar coin, and Sacagawea can be seen on the gold dollar coin. There are no women on paper bills.

    With help from writers and historians, Howard and Stone came up with a voting list featuring 15 important women. Ades says there is a standard for choosing candidates. They look at the women's contributions to our world, and at what challenges they faced.

    More than 72,000 people have voted so far in the poll. Ades says the competition has narrowed to a “very close race”, but won't say who's in the lead. After two rounds of voting, Women on 20s will send their campaign to the White House for consideration. The final decision is up to the Treasury Secretary, Jack Lew. Lew is unlikely to make a change without the president's approval. But last year, when a little girl asked the president why there aren't any women on US currency, he said that adding a woman is a “pretty good idea”.

    They say the average person makes 35, 000 decisions a day. Yet in her new book, How Woman Decide, Therese Huston explores a widespread phenomenon that many women fail to notice. "There's a huge double standard when it comes to how men and women are viewed as decision﹣makers," explains Therese, a psychologist from Seattle University. Therese decided to write the book after looking at her bookshelf: At one end, there were bestselling books about how to be a clever decision﹣maker ﹣ all written by men and featuring interviews with men like athletes. At the other end were books aimed at women on gaining leadership skills and confidence.

    "Once those women are at the table, will their decisions be taken as seriously as men's？" Therese wondered. "Men are respected as decision﹣makers more than women, especially in the workplace, largely because there's this cultural belief that women are unable to make smart choices at work. "

    So, Therese set out to pick apart the stereotypes（固有印象）to see what scientific research had found. "Scientific research shows that men and women struggle with decision-making equally. The only disadvantage I found was that during the teenage years-teenage girls are more indecisive than teenage boys. Otherwise, there's little difference between the genders（性别）.

    However, there are some differences. "Women are more collaborative（协作的）, "says Therese. "A female boss is more likely to ask the opinions of those around her when making a choice. Women ask for input, which helps make better decisions. However, this is often seen as a weakness rather than a strength.

    Therese also found that during times of stress, men and women make different choices, and the outcomes are often better when women are involved.

    Study after study backs this view up. Neuroscientists Mara Mather and Nicole Lighthall from the University of Southern California studied the way men and women make decisions and found that in times of stress, they react very differently.

    During their study, which involved playing a virtual gambling（赌博）game, they found that when the females became stressed, they made smart decisions ﹣ quitting while they were ahead or taking safe bets. But when the men became stressed, they did the opposite, risking everything for a slim chance of a big win.

    Bill Bowerman was a track coach. He wanted to help athletes run faster. So he had learned how to make running shoes. He had also started a shoe company with a friend. It was 1971. Running shoes at the time were heavy. They had spikes (鞋钉) on the sole (鞋底). The spikes tore up the track and slowed down runners.

    To make a lighter shoe, Bill tried the skins of fish. To make a better sole, he wanted to replace the spikes. Bill dug through his wife Barbara's jewelry box. He hoped to find a piece of jewelry with an interesting pattern. He would then copy the pattern onto the new soles. Nothing worked. Bill was defeated.

    Then, one Sunday morning, Barbara made Bill waffles (华夫饼) for breakfast. Bill watched her cook.

    He studied the criss-cross pattern on a waffle iron.

    Inspiration struck. The pattern on the waffle iron was just what Bill was looking for. The squares were flatter and wider than sharp spikes. The pattern would help the shoes hold any surface without tearing into it.

When Barbara left the house, Bill ran to his lab. He took the liquid chemicals that, when mixed, would harden into the sole of a shoe. He poured the mixture into the waffle iron—and the Waffle Trainer was born.

Bill's company put the Waffle Trainer on market in 1974. It was a huge hit. Maybe you've heard of that company—it's called Nike. And today it's worth around $100 billion.

It was the waffle iron that had changed the course of Bill's life—and helped turn Nike into a well-known name. Today, the waffle iron is kept at Nike headquarters. It serves as a reminder that if we keep trying, we can find a solution to even the most difficult problems. And those solutions can come from unlikely places, even the breakfast table.

    If you're planning on travelling, there are a few simple rules about how to make life easier both before and after your journey.

    First of all, always check and double­check departure (起程) time. It is amazing how few people really do this carefully. Once I arrived at the airport a few minutes after ten. My secretary had got the ticket for me and I thought she had said that the plane left at 10：50. When I arrived at the airport, the clerk at the departure desk told me that my flight was closed. Therefore, I had to wait three hours for the next one and missed an important meeting.

    The second rule is to remember that even in this age of credit cards, it is still important to have at least a little of the local currency (货币) with you when you arrive in a country. This can be necessary if you are flying to a place few tourists normally visit. Once I arrived at a place at midnight and the bank at the airport was closed. The only way to get to my hotel was by taxi and because I had no dollars, I offered to pay in pounds instead. "Listen! I only take real money!" the driver said angrily. Luckily I was able to borrow a few dollars from a clerk at the hotel, but it was embarrassing.

    The third and last rule is to find out as much as you can about the weather at your destination before you leave. I feel sorry for some of my workmates who travel in heavy suits and raincoats in May, when it is still fairly cool in London or Manchester, to places like Athens, Rome or Madrid, where it is already beginning to get quite warm during the day.

    As Artificial Intelligence(AI) becomes increasingly sophisticated(复杂的), there are growing concerns that robots could become a threat. This danger can be avoided, according to computer science Professor Stuart Russell, if we figure out how to turn human values into a programmable code.

    Russell argues that as robots take on more complicated tasks, it's necessary to translate our morals into AI language.

    For example, if a robot does chores around the house, you wouldn't want it to put the pet cat in the oven to make dinner for the hungry children. "You would want that robot preloaded with a good set of values," said Russell.

    Some robots are already programmed with basic human values. For example, mobile robots have been programmed to keep a comfortable distance from humans. Obviously there are cultural differences, but if you were talking to another person and they came up close in your personal space, you wouldn't think that's the kind of thing a properly brought-up person would do.

    It will be possible to create more sophisticated moral machines, if only we can find a way to set out human values as clear rules.

    Robots could also learn values from drawing patterns from large sets of data on human behaviour. They are dangerous only if programmers are careless.

    The biggest concern with robots going against human values is that human beings fail to so sufficient testing and they've produced a system that will break some kind of taboos(禁忌).

    One simple check would be to program a robot to check the correct course of action with a human when presented with an unusual situation.

    If the robot is unsure whether an animal is suitable for the microwave, it has the opportunity to stop, send out beeps(嘟嘟声), and ask for directions from a human. If we humans aren't quite sure about a decision, we go and ask somebody else.

    The most difficult step in programming values will be deciding exactly what we believe in moral, and how to create a set of ethical rules. But if we come up with an answer, robots could be good for humanity.