We all know about this famous Kitty. She has no mouth, and she wasn't born out of a TV show or a video game. So how did this cute character become popular? How did she change the world?

    Hello Kitty was created (创造) in Japan in 1974.Sanrio, a company in Japan, was working for a new character to put on their new purse. The first picture of Hello Kitty was introduced on November 1. She was so cute that it became popular soon in Japan and all over the world.

    Hello Kitty is only a character, but she has a story of her own. Her full name is Kitty White, and she's even not a Japanese. She lives in the countryside outside London with her family—George White, Mary White and her twin sister Mimmy. Hello Kitty wears a red bow  (蝴蝶结) on her left ear while Mimmy wears a yellow bow on her right ear.

    Kitty loves goldfish and baking cookies, but her favourite thing is to eat her mum's apple pie! She also loves stars and candies, too. She is in the 3rd grade and she weighs as much as three apples but is five apples tall. She even had a blood (血.) type, which is A.

    Hello Kitty's appearance hasn't changed much, though she turned 40 on November 1, 2014.

    Hip-pop Dancing

    Hip-pop dancing is popular with many young people today. They like it because they can invent their own moves. They use this dance to show their love for life. It also shows that they feel good about life, that they just want to be themselves and enjoy life, and that they are not afraid of problems.

    Hip-hop dancing has a history of more than 30 years. It first began in the 1980s in the US. In early times, it was seen in New York and Los Angeles. At that time, many young black people often danced to music in the streets. They used their legs, arms, heads and even shoulders to dance. Many young people still use most of these moves today.

    Hip-pop dancing became popular all over the world because of the 1983 movie Flash Dance. Some people performed Hip-hop dancing in the movie. People enjoyed their performances. They began to dance like them. Then it became popular. There are two kinds of Hip-pop dancing: the new school and the old school. More and more young people are learning Hip-pop dancing. People believe that it is a good way to exercise their bodies, and that it is good for their health.

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    The great fire of London started in the very early hours of September 2, 1666. In four days, it burnt most of the old city. Many houses were wooden and close together, so they were burnt down. One hundred thousand people lost their homes.

    The fire started on Sunday morning in the house of the King's baker. But the baker, with his wife and family, got out through a window. A strong wind blew the fire from the baker's house into a small hotel next door. Then it was on fire everywhere. But that was only the beginning.

    By eight o'clock three hundred houses were on fire. On Monday nearly a kilometre of the city was burning along the River Thames. Tuesday was the worst day. The fire burnt many well-known buildings. Old St. Paul's and the (Guildhall were among them.

    Samuel Pepys, a famous writer, wrote about the fire: People threw their things into the river. Many poor people stayed in their houses until they died. Birds died because of the hot air.

    The fire didn't stop until the King asked people to push down hundreds of building in the way of the fire. With nothing left to burn, the fire became small and died out at last.

    Many lives and things were lost after the fire, but London became a better place many years later.

Human activity is bringing big trouble to Mount Qomolangma. Both microplastics ( 微塑料)and climate (气候) change have a bad effect (影响) on the mountain, scientists say.

The highest mountain in the world is facing the problem of microplastics. A recent study found that the mountain is full of these plastics, which are usually less than 5 millimeters in size. They canbe found in many things, including the clothing, tents and ropes that are left behind by climbers.

Microplastics take thousands of years to break down ( 分解) on their own. They are already known for posing a danger to  sea animals. Now people are worried about Qomolangma, as themountain already suffers (遭受) from serious pollution.

Global warming is also affecting the mountain, as well as its climbers. Another study points out that the glaciers (冰川) around Qomolangma have thinned by nearly 100 meters since the 1960s. As the ice melts (融化), cracks (裂缝) in the ice are becoming deeper and more dangerous, bringing danger to those who try to climb the mountain, according to Global News.

Landslides (滑坡) are also becoming more probable. There are many parts of the mountain that are held together by just frozen rocks or permafrost (永久冻土), according to Professor Joseph Shea at the University of Northern British Columbia, Canada. When this permafrost melts, the risk of dangerous landslides goes up.

 You are walking down the street. Suddenly it starts to rain and you don't have an umbrella. What do you do? Run or walk?

 Most people would rather run because it will get you out of the rain faster. But if you run, you also run into more raindrops. So, what should you do?

 Things are more complicated(复杂的) than you might think. Franco Bocci, a professor at the University of Brescia in Italy, found that whether you should travel slowly or quickly in the rain depends on the wind direction and your body shape, according to the BBC

 When there is no wind, and the rain lands directly on you, Bocci suggests that you should run and hide as fast as possible. But if the wind comes from behind and blows the rain onto your back, the best thing to do is to walk at the same speed as the wind. This way , both your front and back will stay mostly dry.

 This is not all. When the wind blows in from the side, you' ll have to think about one more thing— your body shape. Thinner people are hit by fewer raindrops. In this case, a fatter person had better run while a thinner person should still try to match their speed to the wind.

" In general, the best thing is to run, as fast as you can- not always, but in general ." Bocci told BBC News," If you' re really thin, it's more probable that there will be a best speed. Otherwise , it is better to run fast."

Now you know what to do next time the rain catches you in the middle of the street. But the best way to stay dry is still to carry an umbrella.

 For as long as humans have appeared, we have been the smartest species(物种) on Earth. Monkeys know how to use simple tools. Elephants can be taught how to count. But things like art, literature, the Internet, and space travel have only been made possible by the amazing intelligence(智力) of humans. And yet, there are some who believe that we can create machines that can think and feel just like we do. Artificial intelligence, or AI, is defined (定义) by Merriam - Webster as"the ability of a machine to copy intelligent human behaviour".

AI is around us every day. From Apple's voice-activated assistant Siri to the software algorithms(算法) that shipping companies use to deal with deliveries,AI is very much a part of our lives.

 But why do we try hard to create machines that can think the way we do? AI can make our lives much easier. Imagine being able to be in a car, tell it the place and sit back in comfort as the AI - guided self- driving car takes you there. We' re already getting there—— Changsha became the first city in China to roll out self - driving taxis in April 

2020. Moreover, AI can control lighting, temperature, and security systems, making homes more comfortable and energy - saving.

 However, there are risks (风险) . What if we somehow produced an artificial intelligence that was smarter than us? Would they control us? Would they take away our jobs? These are difficult questions that AI researchers ask themselves all the time.

 Except for the risks, it has been already clear that Al is here to stay. Only time will tell if it will lead us into a new age of prosperity(繁荣) , or be our end.