Most people around the world are right-handed. This also seems to be true in history. In 1799, scientists studied works of art made at different times from 1,500 B.C. to the 1950s. Most of the people shown in these works are right-handed, so the scientists guessed that right-handedness has always been common through history. Today, only about 10% to 15% of the world's population is left-handed.

Why are there more right-handed people than left-handed ones? Scientists now know that a person's two hands each have their own jobs. For most people, the left hand is used to find things or hold things. The right hand is used to work with things. This is because of the different work of the two sides of the brain. The right side of the brain, which makes a person's hands and eyes work together, controls the left hand. The left side of the brain, which controls the right hand, is the centre for thinking and doing problems. These findings show that more artists should be left-handed, and studies have found that left-handedness is twice as common among artists as among people in other jobs.

No one really knows what makes a person become right-handed instead of left-handed. Scientists have found that almost 40% of the people become left-handed because their main brain is damaged when they are born. However, this doesn't happen to everyone, so scientists guess there must be another reason why people become left-handed. One idea is that people usually get right-handed from their parents. If a person does not receive the gene (基因) for right-handedness, he / she may become either right-handed or left-handed according to the chance and the people they work or live with.

Though right-handedness is more common than left-handedness, people no longer think left-handed people are strange or unusual. A long time ago, left-handed children were made to use their right hands like other children, but today they don't have to.

Paragraph 1 Nature parks for pandas

Paragraph 2 WWF and animals in danger

Paragraph 3 The panda's home

Paragraph 4 An animal in danger

Bio-robots are robots that look like animals. They can fly like birds, swim like fish or move like insects. They are helping researchers learn more about how animals live. 

● Bat (蝙蝠) robot

Bat flight is not simple. Its body parts fold and unfold with every wing beat. The force comes from its strong but thin wings. If you want to make a flying robot, said Science Focus, don't copy bats. 

But that's what researchers did in the US. B2 is a robot made to understand bat flight. It has very thin wings. Can it fly like a bat? Yes! B2 moves its wings and does sharp dives and turns, just like a real bat! 

They hope to make even better robot bats in the future. 

● Guppy (孔雀鱼) robot

Some people think fish are stupid, but there are still many things we can learn about them. 

German researchers now use a robotic fish to better understand group behavior in guppies. The team put a 3D-printed guppy under the fish tank. It copied the speed and direction of a fish partner, who thought the printed guppy was real. 

Researchers learned that swimming speed is important to guppies. When they swim faster, they swim better together. 

● Cockroach (蟑螂) robot

It has four legs instead of six, but this 4.5-centimeter-long cockroach robot can walk and climb walls just like real cockroaches. 

The 1.5-gram robot was made for Rolls-Royce. The engine-maker wants tiny robots to look around inside airplane engines (引擎) because humans can't go there. To meet their needs, engineers thought about cockroaches' sticky feet. 

The robot uses electricity to stick to walls. Engineers tested it inside an airplane engine. It stuck on better than a real insect, according to Science Focus.

Do you know about koalas? The koala is 1 Australian animal. It 2 gray and brown fur(皮毛). And the fur on 3 belly(腹部) is white. Koalas eat and sleep in eucalyptus trees(桉树). 4 almost never get down the trees so somebody thinks they are 5 . They are active 6 night and sleep all day. People often think that koalas are friendly animals 7 they look very cute. But they may scratch(乱抓) people if they are not happy. They have sharp claws(利爪). So please 8 friendly to them. In the past, koalas were often hunted(被捕获) because of their beautiful soft fur. Now they are a protected species(被保护的物种) and it's not right 9 them. We need koalas and other animals, because they are our dear 10 ! 

Many drivers are not very clear about the roads in strange places. Especially, the navigation(导航) just tells the exit number, which makes it easy for drivers to get on the wrong road. However, now you don't have to worry about these complicated(复杂的) roads anymore. Lane(车道)level navigation based on the Beidou satellite system(北斗卫星系统) will be popular in China very soon.

The socalled lanelevel navigation uses highlycorrect technology to show us the real road situation. Compared with past navigation, it can provide exact road guidance in some complicated parts to help drivers choose the best way.

In January 2023, an online map officially introduced an enhanced version(加强版) of lane­level navigation, which helped make good use of the Beidou satellite system more deeply. It greatly improved the speed of receiving information and giving answers and the accuracy of accuracy lanelevel positioning.

In the new version of the online map, lanelevel navigation can be used on all kinds of roads. The new version has a different advantage from the old one: it can guide us clearly where to go in complicated crossings.

In big cities, for drivers who come to these cities for the first time, overhead bridges make it easy to make driving mistakes in strange places. So how does lane­level navigation solve the problem? After careful study, planning and organization, lanelevel navigation uses the Beidou satellite system to improve the positioning accuracy and guide drivers.

For the driverless industry, this map is a good piece of technology, which makes it safer and more widely used.

Scientist have developed a way to read minds, translating unspoken thoughts into written words. It's the first time it's been done without having to put anything into the brain. They used artificial intelligence (AD). It is the name given to a computer system that is able to "think" for itself and carry out tasks that usually require human intelligence. 

Scientists used a special scanner (扫描器). The machine can see where blood runs, which shows the parts of the brain that are most active. People taking part in the experiment (listened to the radio for 16 hours as their brains were scanned. The AI tool learned to connect certain brain activity with words they heard. After that, each person was asked to think of a story, and the AI tool managed to pick up these thoughts as they happened. 

The results had about a50%accuracy rate (准确率), although the AI found it hard to work out the meaning of pronouns, such as he or she, her or him. For example, it turned "I don't have my driver's license yet" into "She has not even started to learn to drive yet". It could usually understand the meaning of what someone was thinking rather than the exact words. The AI was personalized, so when it had learnt form one person but it was tested on another, it couldn't understand their thoughts. 

The scientists, who have been working on the technology for 15 years, say they understand the risks of it being used badly. Scientist Jerry Tang told a newspaper, "We want to make sure people only use these types of technololgies when they want to, and that it helps them." The scientists hope it will help people with certain medical conditions, who are still awake but have lost the ability to speak, to communicate once again.