What do Leonardo da Vincii, Marie Curie, and Albert Einstein have in common? They were all left-handed, along with other famous people including Brad Pitt Prince William, and Barack Obama. In fact, an estimated 13 percent of the world's population may be left-handed and still most people around the world are right-handed.

    What makes a person become right-handed rather than left-handed? As yet no one really knows for sure. One simple idea suggests that people normally get right-handedness from their parents. Studies have found that two right-handed parents have only a 9.5 percent chance of having a left-handed child, whereas two left-handed parents have a 26 percent chance of having a left-handed child. Another common theory is that left-handed people suffer mild brain damage during birth, which makes them left-handed. However, if this theory were true, it would not explain why the percentage of left-banded people is so similar in every society, when birth conditions vary so much from society to society.

    Whatever the reasons behind it, people's attitudes toward left-handedness have changed a lot over the years. Statistics show that although 13 percent of young people (10-20 years old) are left-handed, only 6 percent of the elderly are left-handed. Left-handed children used to be punished until they began using their right hand like other children, but today people who are left-handed are no longer looked down on nor are they considered abnormal. For most people today, either case is perfectly acceptable.

    The last time I visited my eighty­three­year­old mother­in­law, I asked how she was feeling. It's a valid question. She has, after all, had two knee replacements and a liver transplant. She moves slowly to avoid another fall.

    But she hasn't stopped moving. She and my father­in­law attended their first Jimmy Buffet concert this summer. Here's the thing about my in­laws: They never say no to an invitation or a new adventure. If they can make it work, they're willing to try just about anything. When we need them to come to stay with the kids, we have to get on their calendars far in advance.

When asked how she was feeling, my motherinlaw responded, "Well, everything hurts every day. But you know what I've discovered? It doesn't hurt to smile. So that's what I've decided to do... smile at everyone I see. I may not be able to do all the things I used to do, but I can at least brighten someone's day."

    It is such simple wisdom. Moving the focus from what we don't have and from what we've lost to what we can offer others is the difference between living in the dark and radiating light. They inspire us daily.

    The key to a life worth living, I think, is to change our views. You don't have to make great changes. Sometimes change looks similar to everyday kindness. Sometimes change begins with holding the door for a mother with an armful of groceries.

    In theory, the butterfly effect says that the smallest breeze(微风) from a butterfly's wing can change the path of a hurricane halfway. Imagine, then, the possibilities that exist within a single smile.

5 books I loved in 2018

By Bill Gates

    A great read is the perfect gift and I think everyone could use a few more books in their lives. My book list covers various topics, including an autobiography on learning throughout a life, a deep search on autonomous weapons (武器), a thriller about the fall of a once­promising company and a guide about meditation (冥想)­there's something for everyone.

    The Head space Guide to Meditation and Mindfulness, by Andy Puddicombe. The book starts with Puddicombe's personal journey from a university student to a Buddhist monk and then becomes an entertaining explainer on how to meditate. If you're thinking about trying mindfulness, this is the perfect introduction.

    Army of None, by Paul Scharre. It's an extremely complicated topic, but Scharre offers clear explanations and presents both the advantages and disadvantages of machine­driven warfare. His fluency with the subject should come as no surprise: he's an ex­soldier who helped draw up the U.S. government's policy on autonomous weapons.

    Bad Blood, by John Carreyrou. Carreyrou gives you the definitive insider's look at the rise and fall of a company. I found myself unable to put it down once I started. This book has everything: magazine cover stories, ruined family relationships, and the failure of a company once valued at nearly $10 billion.

    21 Lessons for the 21st Century, by Yuval Noah Harari. I'm a big fan of everything Harari has written, and his latest is no exception. If 2018 has left you stressed out by the state of the world, 21 Lessons offers a helpful framework for processing the news and thinking about the challenges we face.

    Educated, by Tara West over. Tara never went to school or visited a doctor until she left home at 17. I loved this life story of a young woman whose thirst for learning was so strong that she ended up getting a P.h.D. from Cambridge University.

    The problem of robocalls has gotten so bad that many people now refuse to pick up calls from numbers they don't know. By next year, half of the calls we receive will be scams(欺诈). We are finally waking up to the severity of the problem by supporting and developing a group of tools, apps and approaches intended to prevent scammers from getting through. Unfortunately, it's too little, too late. By the time these "solutions" become widely available, scammers will have moved onto cleverer means. In the near future, it's not just going to be the number you see on your screen that will be in doubt. Soon you will also question whether the voice you're hearing is actually real.

    That's because there are a number of powerful voice manipulation (处理) and automation technologies that are about to become widely available for anyone to use. At this year's I/O Conference, a company showed a new voice technology able to produce such a convincing human-sounding voice that it was able to speak to a receptionist and book a reservation without detection.

    These developments are likely to make our current problems with robocalls much worse. The reason that robocalls are a headache has less to do with amount than precision. A decade of data breaches(数据侵入)of personal information has led to a situation where scammers can easily learn your mother's name, and far more. Armed with this knowledge, they're able to carry out individually targeted campaigns to cheat people. This means, for example, that a scammer could call you from what looks to be a familiar number and talk to you using a voice that sounds exactly like your bank teller's, tricking you into "confirming" your address, mother's name, and card number. Scammers follow money, so companies will be the worst hit. A lot of business is still done over the phone, and much of it is based on trust and existing relationships. Voice manipulation technologies may weaken that gradually.

    We need to deal with the insecure nature of our telecom networks. Phone carriers and consumers need to work together to find ways of determining and communicating what is real. That might mean either developing a uniform way to mark videos and images, showing when and who they were made by, or abandoning phone calls altogether and moving towards data-based communications — using apps like FaceTime or WhatsApp, which can be tied to your identity.

    Credibility is hard to earn but easy to lose, and the problem is only going to get harder from here on out.

    A 27-year-old inventor, Joco Paulo Lammoglia, has come up with a new device ( 设 备 ) named the AIRE mask, which is capable of transforming the wind energy provided by the wearer's breath into electrical energy. This means breathing has become a source of renewable energy. The inspiration for the invention came from his watching children blowing on pinwheels (纸风车).

    The device is worn like a mask equipped with tiny wind turbines (涡轮) and it can work its magic even while people are sleeping, running or hanging around, since energy is created from one's breath. The principle of this AIRE mask is simple. The invention uses the wind flow created by breathing and changes it into energy that can charge mobile phones and iPods. Simply put this mask connected to your mobile phone on your face. The rest takes place naturally through your breath that provides power to run turbines which produce electricity.

    Lammoglia explained how useful he hopes the AIRE will become. He said, "I hope to bring the concept into production and reduce the carbon footprint. It can be used indoors or outdoors, while you're sleeping, walking, running or even reading books." Apart from saving energy and contributing to environmental protection, it also encourages the practice of physical exercise. This is an entirely all time renewable energy source. Its energy is available 24 hours a day, seven days a week.

    Lammoglia explained why he thought the AIRE was so useful, saying, "Though many of our modern devices offer benefits, they tend to consume a high amount of electrical energy. This may cause problems for the environment, especially if the energy used by these devices is produced by non-renewable sources.

    The AIRE mask will be future's cheaper source of charging mobile phones. It would save energy and allow people to never have to worry about their phone dying unless they stop breathing.

The Tokyo Olympics have been postponed until 2021. That delay offers a chance for reflection. The International Olympic Committee wants to make the games more popular with young people. To that end, it is introducing new events, such as skateboarding, surfing and climbing. Why not go further and let national teams compete at video games? Electronic sports such as "Fortnite", are vastly more popular than strange Olympic sports like curling (冰壶). In fact, they are more appealing than most mainstream sports. Only 28% of British boys aged 16-19 watch any traditional live sports; 57% play video games.

Some may complain that e-sports are not proper sports. Many parents, observing their teenagers sitting on the sofa all day shouting "Quick, pass me the shotgun!" at a screen, would agree. Yet video games are highly competitive, with professional teams that play to packed stadiums. There are perhaps only 200 tennis stars in the world who can make a living from playing in major competitions. By contrast, "League of Legends", a fantasy game played by teams of five, supports over 1,000 on good wages. Its World Championship final last year was watched by 44 million people.

Those against e-sports offer moral objections, too. They are addictive. Prince Harry has called for "Fortnite" to be banned for this reason. They are violent. At a time of global disharmony, it is bad idea to make virtual (虚拟的) killing an Olympic sport. The Olympics aim to promote peace.

Neither of these arguments is convincing. The idea that an activity, rather than material, can be addictive is controversial among doctors, as is the existence of a causal (因果的) link between gaming and violence. And the belief that warlike sports have no place in the Olympics is hard to agree with history. Wrestling was introduced in 708 BC. It is still there.