Harper Lee, whose 1961 novel To Kill a Mockingbird on the racial troubles of the American deep south, has died at the age of 89.

    Until last year, Lee had been something of a one-book literary legend. To kill a Mockingbird sold more than 40 million copies around the world and earned her a Pulitzer prize, remaining a towering presence in American literature. Another novel, Go Set A Watchman, was controversially published in July 2015 as a “sequel” to Mockingbird, though it was later confirmed to be Mockingbird's first draft.

    But from the moment Mockingbird was published to almost instant success, the author consistently avoided public attention. Lee had lived for several years in a nursing home near the house in which she had grown up in Monroeville, Alabama—the setting for Maycomb of her famous book. Her neighbor for 40 years, Sue Sellers, said, “She was such a private person. All she wanted was privacy, but she didn't get much. There was always somebody following her around.”

    James Naughtie, BBC Books Editor, commented on the novels of Harper Lee: “I think she stands, particularly among American readers, as someone who shone a light into a very dark place. She was writing at a time when people were beginning to lift the lid on everything in the South which they'd chosen not to understand. That all changed in the 1960s. So I think her status for writing that book in its extraordinarily direct way will remain.

    A punctual person is in the habit of doing a thing at the correct time and is never late for anything.

    An unpunctual man never does what he has to do at the right time. He is always in a hurry and in the end loses both time and his good name. A lost thing may be found again, but lost time can never be got back. Time is more valuable than material things. In fact, time is life itself. An unpunctual person is always wasting his most important things as well as others'. An unpunctual person is always saying unhappily that he finds no time to answer letters or return calls. But the man who really has much to do is very careful of his time. He knows that he cannot finish all his work unless he carefully does every piece of work.

    Being unpunctual is the sign of disrespect towards others. If a person is invited to dinner and arrives later than the time when he should be there, he keeps all other guests waiting for him. Usually this will be thought as a great disrespect for the host and all the other guests.

    Not like a punctual person, an unpunctual one cannot do his duty wonderfully, whether it is public or personal. Imagine how it would be if those who should do important tasks failed to be on time. A man who is known to be unpunctual is never believed by his friends or fellow men.

    It's not easy being a teenager— nor is it easy being the parent of a teenager. You can make your child feel angry, hurt, or misunderstood by what you say without realizing it yourself. It is important to give your child the space he needs to grow while gently letting him know that you'll still be there for him when he needs you.

    Expect a lot from your child, just not everything. Except for health and safety problems, such as drug use or careless driving; consider everything else open to discussion. If your child is unwilling to discuss something, don't insist he tell you what's on his mind. The more you insist, the more likely that he'll clam up. Instead, let him attempt to solve things by himself. At the same time, remind him that you're always there for him if he seeks advice or help. Show respect for your teenager's privacy (隐私). Never read his mail or listen in on personal conversations.

    Teach your teenager that the family phone is for the whole family. If your child talks on the family's telephone for too long, tell him he can talk for 15 minutes, but then he must stay off the phone for at least an equal period of time. This not only frees up the line so that other family members can make and receive calls, but teaches your teenager moderation (节制). Or if you are open to the idea, allow your teenager his own phone that he pays for with his own pocket money or a part-time job.

    You may think that light pollution isn't something extraordinarily important. You may believe that every other type of pollution has a larger impact on the environment than light pollution does. But light pollution is serious.

    Light pollution, or "sky glow", is the glow you can see at night above cities and towns. Light pollution is a problem that has been accompanying man ever since he started his first fire some 15,000 years ago. Light pollution is the light that comes from streetlights, buildings, parking lots and any other source of light that is reflected or directed into the atmosphere.

    Urban light pollution means that one­fifth of the world's population can no longer see the Milky Way with the naked eye(肉眼). Many city kids, even if they did look through the orange smog above their heads, would probably see only a handful of stars. We have lost our view of the stars, and we have mucked up our night­time environment as well. Astronomers are calling for the dark places on Earth to be preserved as national parks.

    Lots of people find the ever­brightening night annoying, and animals that are programmed to prefer the dark may avoid a brightened habitat. Sea turtles can get lost searching for a beach to lay eggs, and their hatchlings(孵化的幼仔)may confuse over­lit beachfront resorts for the ocean horizon, wasting precious energy needed to find the sea and escape predators(食肉动物). Because their necks aren't yet long enough to see things far away, baby turtles rely on the mirror image of the moon to guide them to the sea, to begin their new life. A car may even hit a particular turtle, which was thinking the light from a nearby city was moonlight reflecting off the ocean waves. Birds that live in and around cities can die because of sky glow, too. The bright lights can blind them, leading to countless collisions with buildings and other tall structures.

    On an individual level, people can help reduce much sky glow by using lighting only when necessary. The stars above us are priceless heritage— for not only for astronomers but for all humans. More of our children should be able to look up at night and see the Milk Way.

Choose a friend who is honest. A friend that is honest is one of the best friends you can have. An honest friend will keep you from walking out of the house wearing that awful green shirt. They're supportive in their honesty. {#blank#}1{#/blank#}.

Choose a friend who stands by you in the hard times. {#blank#}2{#/blank#} There are all kinds of laughter and joyful moments, and those times make relationships easy. But who are the people that stand by you when times turn hard? Those are your true friends.

Choose a friend who gives as much as he or she takes. We've all had friends that only want things from us. {#blank#}3{#/blank#}When a relationship is one-sided, we just end up feeling angry. It's not healthy. Choose a friend with whom you feel a balance of give and take.

Choose a friend who likes the things you do. While friendship is full of compromise (妥协)，it helps if you choose friends who share a lot of your interests. {#blank#}4{#/blank#} It makes deciding on things to do easier. You don't have to choose a friend who likes every single little thing you do, but you should have some shared interests.

{#blank#}5{#/blank#}Friends need to laugh together. Choose a friend who can laugh with you rather than at you. Look for someone who will laugh with you at a look or a glance. Those people will be some of your best friends.

A. In some ways, they are family.

B. Choose a friend who gets your faith.

C. It gives you things to talk about or share.

D. Choose a friend who gets your sense of humour.

E. And you should choose someone that will not lie.

F. It's easy for us to be good friends in the fun times.

G. But they never seem willing to give anything to us when we need it.

Advances in generative artificial intelligence (AI) have enabled authentic-sounding speech synthesis (语音合成) to the point that a person can no longer distinguish whether they are talking to another human or a deepfake (深度伪造). If a person's own voice is "cloned" by a third party without their agreement, bad guys can use it to send any message they want.

Computer scientist and engineer Ning Zhang has developed a new method to prevent unauthorized speech synthesis before it takes place: a tool called AntiFake.

Traditional deepfake detection methods only work after the damage is done. However, AntiFake prevents voice data from being synthesized into an audio deepfake beforehand. This tool turns the tables on cybercriminals (网络罪犯) by using similar voice cloning techniques they employ, but for voice protection. The software complicates voice data extraction and feature identification crucial for voice synthesis. "We're using an opposite AI technique originally used by cybercriminals, but now we're using it against them," Zhang explained. "We slightly change the recorded audio, just enough to make it unusable for voice clone training while still sounding natural to humans."

Ben Zhao, a professor of computer science at University of Chicago, says that the software, like all digital security systems, will never provide complete protection. But, he adds that it can raise the bar and limit the attack to a smaller group of individuals with significant resources.

AntiFake can already protect shorter voice recordings against cloning. The creators of the tool believe that it could be extended to protect larger audio documents or music from misuse. But the methods and tools that are developed must be continuously adapted because cybercriminals will learn and grow with them.