Do you think you are fat? Do you want to be healthy? Let’s do exercise together! We have three groups for you to join:

If you like peanut butter, you’ll love this recipe(食谱). The steps are easy, and there’s nothing to cook. You can make it all by yourself!

DIY Recipe from the kitchen       What you need: 2 cups of graham cracker(全麦粉);       1/2 cup of peanut butter 2 teaspoons of sugar;                           1/3 cup of corn syrup(糖水) 1/2 teaspoon of cinnamon(肉桂皮);       1 cup of powdered sugar 2/5 teaspoon of nutmeg(肉豆蔻) What you do: First, mix together the graham cracker, sugar, cinnamon, and nutmeg in a bowl. Next, add the peanut butter and corn syrup. Mix well. Then, roll the mixture into balls. Place them on a large plate covered with wax paper. Leave the plate in the fridge for an hour. Finally, take peanut butter balls out of fridge. Put powdered sugar in a small bowl. Roll each ball in the powdered sugar until it is covered.

What do black holes look like? We finally got the answer: they look like dark circles with a bright ring around the outside. Scientists took the world’s first photo of a black hole. The black hole is very far from Earth—about 55 million light years away. This is not the only black hole in the universe.

Black holes are mysterious in the universe. A photo can help us learn more about them. How much do you know about black holes? Try to answer the following questions.

Q: What is a black hole?

A: A black hole comes from a dying star. The star turns in to a small point. The point has much mass and strong gravity (引力) . The strong gravity of a black hole pulls things. The black hole “eats” these things. Black holes can even “eat” light. That’s why a black hole looks “black”.

Q: If black holes are “black”, how do scientists know they are there?

A: We cannot see black holes. But we can see how their strong gravity works on the things around them. A black hole’s gravity pulls dust and gas into it. And if a star is orbiting (绕轨道运行) a point in space, scientists can study the star’s orbit. They can tell if the star is orbiting a black hole.

Q: How did scientists take the picture of the black hole?

A: Scientists didn’t use a camera to take the picture. They used eight radio telescopes in different places across the world. The telescopes got information from the black hole. Scientists used computers to deal with the information. It took them two years to get the final picture.

Q: Will the sun turn into a black hole? And if it does, will it “eat” Earth?

A: The sun won’t become a black hole. According to NASA, it does not have enough mass to turn into one. When the sun dies, it will become a smaller and cooler star. Even if the sun becomes a black hole, Earth would still be safe.

Scientists are now using new technologies and making innovative(创新的) products to give them a hand.

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Big data(大数据)

Our smart phones send data to telecom companies(电信公司) around the clock, telling these companies where we have been and where we are going. Chinese telecom companies provide governments with the data.     17     They can also track how many people were coming to and going out of Changsha during the outbreak of the COVID-19.

Drones (无人机)

Drones have played an important role in disinfection(消毒) and preventing cross-infection(交叉感染) in crowded places like hospitals, railway stations and airports.     18     For example, if people gather in large groups or do not wear masks, drones with cameras can warn(警告) these people.

Robots

    19     They are used at hospitals to offer medical advice, offer medicine or meals, check people’s body temperature and do other repetitive(重复的) work over and over again. In this way, robots can not only help doctors and nurses, but also reduce the cross-infection.     20