Have you ever fancied sailing around the world or buying a holiday home in the Caribbean? Well, before you get too excited, it may help to find out if you have what it takes to become a billionaire.   

    We've all heard stories of school drop-outs who have made their fortune. Do they tend to be university graduates or self-made successful people? Are they married or single?

    Thanks to a recent analysis of people in Forbes（福布斯）Top 100 Billionaires List, we can now find out what they have in common. We know what percentage wear glasses and even how many are bald!

    If you are deciding whether or not to go to university, it may help you to know that 76% of the richest people in the world have a degree. According to this study, of those 76%, 47% have a bachelor's degree, 23% have a master's and 6% have a doctorate. Don't lose hope if you aren't very academic, though. It's worth noting that many of those on the list did not pass all their exams with flying colors. Microsoft founder Bill Gates dropped out of Harvard University after two years of study. And Chinese business magnate Jack Ma, failed his university entrance exams three times before going on to complete his degree and make his millions.

    Another interesting trend is that the world's richest people are much more likely to be married - only 12% of billionaires are unmarried. Finally, the percentage of billionaires who are bald is quite high – so don't worry if you're losing your hair.

    Pizza is a pretty universal treat, but where did it start? Here are three things you probably didn't know about pizza.

    1: Pizza's Origins Are Half-Baked.

    The Neapolitans（那不勒斯人）in Italy are proud of saying they invented pizza, but it's probably more accurate to say, they perfected it. The idea of putting toppings on a flatbread and baking it started in the 6th century B. C. But the people of Naples were the first to put tomato on a flatbread in the 16th century. From its start, pizza was a food of the poor, as it was cheap, filling and easy to eat on the run. In Italian, the word “pizza” refers to anything that is made and then pressed flat.

    2: Pizza Margherita Is Not Exactly a Symbol of Italy.

It was said some day in 1889, a local baker named Raffaele Esposito created three pizzas for Queen Margherita when she was on a tour of Italy. The queen loved the version that had tomato, basil and mozzarella cheese— and just happened to match the colors of the Italian flag. So Esposito named the pizza after her.

    But Pizza historian Scott Wiener points out that Italy was unified in name only in 1889 so it was unlikely any Neapolitan baker would want to celebrate “the Northern conquerors.” Further, the letter of gratitude for the pizza from the royal household that Pizzeria Brandi displays appears to be a fake（赝品）and may just have been a marketing plan.

    3: Hawaliian Pizza Invented by a Canadian.

    Sam Panopoulos, from Greece originally moved to Canada at the age of 20. In 1962, he decided to put some ham and pineapple on a pizza at one of his restaurants in Ontario.

    “We just put it on for fun to see how it was going to taste,” he told the BBC in 2017. Panopoulos named it the Hawaiian pizza after the brand of canned pineapple he used. The mix of sweet and savory toppings caught on with a certain part of the pizza-loving public. The inventor died in 2017.

    Darwin noted that some human emotional expressions might have started as part of a physiological function: for example, exposing the teeth to bite food. The function, however, took on meaning and became a form of communication which signals anger.

    The same may be true for the animals. Baby monkeys cry for attention. They also cry to signal to an adult that they want to be carried.

    “Chimpanzees do make upset voice when they are being weaned (断奶) by their mothers or have lost their mothers or another individual,” says Anne Pusey, a professor at the University of Minnesota. “They whimper (呜咽) and cry and scream. When we hear these calls, the emotion involved seems obvious. However, they do not weep in the sense of producing tears. I have seen an adolescent male whimpering when he lost sight of his older brother with whom he had been traveling.”

    Babies of many mammalian species, including rats, cry. Moreover, when a baby rat cries, often his mother brings the fallen pup back into the nest. This is probably a straightforward communication, as it is with humans. However, psychologists at the University of Iowa aren't convinced.

    The Iowan researchers can cause the same crying sounds by producing large decreases and then increases in blood flow. The blood flow also goes down when baby rats get cold. Thus, they conclude baby rats cry in the same way that we sneeze. Of course the rat baby could be crying because he's cold and wants his mother to know.

    “All young mammals make cries when separated from their mother,” says Jaak Panksepp, a psychologist at Bowling Green State University. “If you're willing to call this crying, then certainly other animals show this emotional response.” he says, “Some of us take seriously that animals do have emotions.”

    We often seek food after focused mental activity, like preparing for an exam. Researchers guess that too much thinking consumes a lot of energy from the brain. So the brain, sensing that it may soon require more calories to keep going, apparently leads to bodily hunger, and even though there has been little physical movement, we eat.

    The researchers note that tiring activity both increases the amount of blood sugar and lactate(乳酸盐)circulating in the blood and increases blood flow to the head.

    Because the brain uses sugar and lactate as fuel, researchers wondered if the increased flow of fuel—rich blood during exercise could feed a worn—out brain and reduce the urge to overeat.

    Thirty—eight healthy college students were invited to determine their fitness and metabolic(新陈代谢)rates and to report what their favorite pizza was. Afterward, they sat quietly for 35 minutes before being given as much of their favorite pizza as they wanted. At a later date, the volunteers returned and spent 20 minutes making selections from college and graduate-school entrance exams.

    Next, half the students sat quietly for 15 minutes, before being given pizza. The rest of the volunteers spent those 15 minutes doing intervals on a treadmill(跑步机)two minutes of hard running followed by about one minute of walking, repeated five times. These students were then allowed to gorge on pizza, too. But by and large, they did not overeat.

    When the researchers factored in(将……作为因素考虑)the calories burnt on running, they determined that those students actually consumed 200 fewer total calories after their brain workouts than the resting students.

    The researchers do not know if the runners consumed extra calories at dinner. They also cannot tell whether other types of exercise would have the same effect as running, although the researchers say they suspect that if an activity causes someone to break into a sweat, it should also increase blood sugar and lactate, feeding the brain and weakening hungers call.

Dogs

    Almost everyone likes dogs, and almost everyone likes to read stories about dogs.

    I have a friend who has a large police dog named Jack. Police dogs are often very clever. Every Sunday afternoon my friend takes Jack for a long walk in the park. Jack likes these long walks very much.

    One Sunday afternoon a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Jack for his walk. But the visitor still stayed. Jack became very worried. He walked around the room several times and then sat down in front of the visitor and looked at him. But the visitor paid no attention (注意).He kept on talking. Finally Jack could stand it no longer. He went out of the room and came back a few minutes later. He sat down again in front of the visitor but this time he held the visitor's hat in his mouth.

    Here is another story about a clever dog. It was a seeing-eye dog. A seeing-eye dog is a special dog that helps blind people walk along the streets and do many other things. We call these dogs "seeing-eye" dogs because they are the "eyes" of the blind man and they help him to "see". These dogs usually go to special schools for several years to learn to help blind people.

    One day a seeing-eye dog and a blind man got on a bus together. The bus was full of people and there were no seats. One man, however, soon got up and left his seat. The dog took the blind man to the seat, but there was very little space. The dog began to push the people on each side with his nose. He pushed and pushed until the people moved down and finally there was enough space for two people. The blind man then sat down and the dog got up on the seat at his side. He lie down and put his head on the leg of the blind man. He was very comfortable and soon fell asleep. Everyone on the bus had to smile at the intelligence (聪明) of the dog in making space for the blind man and, at the same time, making a place for himself.

    When my father married my mother in 1943, he gave my mother a 1937 crown coin and told her to keep it in the back of her purse and not to spend it. This would mean that she always felt that she was protected and would always have money if she really needed it.

    When I was married in 1970, my husband, who had heard this story, obtained a 1937 crown coin for me and I have always kept it in my wallet, and I have always had enough for my needs.

    A friend recently fell on hard times, partly through external (外部的) circumstances and partly through poor planning. Friends and I have loaned her money, paid her bills, given her food, and even tried to teach her budget techniques, but none of them has been a solution. She has just slipped deeper and deeper into financial trouble and depression.

    Last week she looked pale and unwell, very depressed and hopeless, very sad for a friend to see and I then thought about how the crown coin, a physical reminder of another's care and love had protected me, so I went to the bank for a $ 100 dollar-bill.

    I told my friend the story and asked her to keep the $ 100 in the back of her wallet. It turned out that she didn't have a wallet, so she put the money in a little pencil case where she kept her coins. She immediately felt better—"I feel rich, and thank you for being a good friend," she said, and we were both a bit teary.

    I went home and remembered a little wallet I had that I'd never used, and thought, "I'll give that to my friend." I opened it, and inside, found $ 100.