Today, roller skating is easy and fun. But before 1750, no one has the idea of skating. That changed because of a man named Joseph Merlin. Merlin's work was making musical instruments.

One day Merlin received an invitation to attend a music party. He was very pleased and a little excited. As the day of the party came near, Merlin began to think how to make a grand entrance(入场) at the party. He had an idea. He thought he would get a lot of attention if he could skate into the room.

   Merlin tried different ways to make himself roll. Finally, he decided to put two wheels under each shoe. These were the first roller skates in the world. Merlin was very proud of his invention and dreamed of arriving at the party on wheels while playing the violin.

   On the night of the party Merlin rolled into the room playing the violin. Everybody was surprised to see him. There was just one problem. Merlin had no way to stop his roller skates. He rolled on and on, suddenly, he ran into a huge mirror that was hanging on the wall. Down fell the mirror, breaking into pieces. Nobody forgot Merlin's entrance.

Artificial intelligence (AI)(人工智能) is the ability of a computer program or a machine to think and learn. It is also a field of study that tries to make a computer “smart”. John McCarthy, a scientist, came up with the name “artificial intelligence” in 1955. Many things such as learning and problem solving can be done by computers, though not in the same way as we do.

An unusual goal of AI research is to create computer-programs that can learn, solve problems, and think logically（逻辑地）. At present we use the term AI for successfully understanding human speech, recognizing（识别）human faces, operating self-driving cars and competing in some game systems like Chess and AlphaGo（阿尔法围祺）. Some people also consider AI a danger to humans if it develops too quickly. Professor Stephen Hawking（霍金）, a well-known British scientist, was not for this kind of technology.

Math is the basic language of AI. If we raise the standard in the learning of math, our students will be more likely to become successful AI designers in the future. We not only want bright students, but also need to attract average students and give them the math skills which are needed to change them into AI designers. Besides, a good knowledge of computer science is also necessary for AI designing.

Scientists hope to create creative and emotional AI which can possibly understand human feelings or create art. Many ways and tools have been tried to discover this fascinating field.

Anyone who walked into a restaurant during the pandemic knows that the QR code is a contact-less(无接触) way to look at a menu. But the Better Business Bureau (BBB) is warning customers that they need to be extra careful if they’re sent a digitally readable square known as a QR code.

One victim told the BBB that they received a cheating letter about student loan. It contained a QR code that appeared to link to the official Studentaid. gov website. The QR code also helped the letter, which was part of a cheating, appear official.

As the QR codes have become more commonly used, the BBB notes that it has received reports of scammers using the system to their advantage across the United States. “This is much like a phishing scam,” Laura, director of marketing for Eastern Michigan, said. “Just like clicking links, you have to be careful what website you’re opening on your smartphone. If you’ve never heard of the organization or the website where the QR code is supposed to go to, that’s a huge red flag.” She said the use of the QR code by scammers offers another way to steal personal information or get you to download malware(恶意软件) onto your smartphone.

The scammers can now send messages to one or all people in a user’s address book, or even send a payment to where it cannot be recovered, according to the U. S. Army Major Cybercrime Unit. “In some scams, the QR code takes you to a phishing website, where you are required to enter your personal information for scammers to steal,” the BBB warned. “Other times, scammers use QR codes to payment apps or follow a bad social media account.”

Scams can differ, but the scammers want you to scan the code right away. What you need to do, though, is to step back and make sure any information is legitimate(合法的) before you scan the code. Phone the friend or coworker directly to see what they might have sent, and make sure the sender wasn’t hacked.

Adam Levin, an expert, says it’s a good rule of thumb to turn your smartphone off and restart it regularly. “Many forms of malware that live in your smartphone, such as spyware, depend on the device never being turned off.” Levin said.