Mom often says, "Cooking is an important skill, and it can be fun!" But I had no interest in cooking at all  I met with a cooking app（应用软件）. There are different kinds of recipes（菜谱）in the app. They offer detailed instructions  users can follow them step by step. Most of them even include photos or videos, which are quite useful for beginners. Last week, I picked up a popular recipe to cook fish. When I  , it was exactly what I wanted and tasted delicious. Then I tried more recipes. Now I can cook a couple of  . I find cooking is great fun and it seems that I  cooking. My plan is to invite my friends over next weekend and show them my new skills. I hope they will like my cooking.

Today, we still have some environmental problems. As a middle school student, we should do something to improve more environmental .

On the one hand, we ourselvesdestroy the environment, such as throwing the rubbish about. We canpart in some commonweal（公益）activities to plant more trees, for the trees are good to our environment. On the other hand, if someone does harm to the environment, like spitting on the ground or stepping on the grass, we can stop them from so, If there's a factory which destroys the environment, we can tell the relative（相关）department or the police about it.

All in all,  we are students, we can still do a lot to protect our environment, and we should take action from now on.

When Ariel rode her bike to the riverside, last November, she planned to go hiking and bird-watching. Bingo! A mile into her walk, she a beautiful swan(天鹅) lying near the riverside. Ariel had worked at the Wild Bird Fund rehab center (康复中心) and knew that swans can be aggressive(攻击性的). But as she got close to this one, she found that it was hurt. "I it, or it will die," she thought.

Ariel put her jacket over the bird's head it calm. She gently picked it up, and held it in her arms. And then she thought, "What do I do now?" Her best choice the rehab center, but that was across the river and on the other side of the city. How was she going to transport a 17-pound swan on her bike all that way? Luckily, when she around for help, some strangers drove by and offered her, her bike and the swan a ride to a nearby subway station.

Ariel called the rehab center on the way, and an animal-care manager picked her up at the subway station and drove the bird, the bike and her to the center. There, the swan , treated and taken good care of. By now, the bird many swan friends there, and it is living a happy life. It's really a happy ending.

 The real story is just how far some people are willing to go to save a swan in the big city. In all, Ariel spent two hours on foot, by car and subway. "If an animal is in danger, I whatever I can. I always happy because of this," she said.

That's the perfect summary of who she is. Do you agree?

When the other models appeared on the stage, the audience cheered and clapped. Then it was Niu's turn. The audience suddenly became . However, after four or five seconds, Niu heard someone next to the stage say in admiration, "So cool!"

Niu Yu, 24, became a(n) star at Shanghai Fashion Week for her confidence, even though she was wearing a prosthetic leg. When Niu was only 11, she lost her right leg during the Wenchuan Earthquake.

Niu has won lots of praise. This gives those who have prejudice(偏见)against the disabled a hit on the nose. "I by something they said. They said the traditional view was that sports were for people with legs, but sports should be a kind of spirit. Even though I have lost a leg, I still deeply love sports and will do so forever, " Niu said. Actually, Niu first drew the public's attention when she a marathon — a 42-kilometer race in 2018, which was held in Wenchuan to mark the anniversary （周年纪念）of the earthquake.

Now, Niu works as a photographer and has more than 850,000 on social platforms, such as Douyin. "I feel I have a social responsibility to bridge the disabled and the public. Showing my life to the public can allow them to understand our group and can also tell other disabled people that our society is more tolerant（宽容）than they imagined, " she explained.

Laughter is good for you, and that's no joke! A good laugh helps you right away. When you laugh, changes in your body. For example, you take in  air than usual, which is good for your heart. A good laugh increases your heart rate. When you laugh, your brain also releases (释放) chemicals that make you feel happy. Laughing can also make you feel relaxed for up to 45 minutes.

Laughter can  reduce pain. You probably don't want to chuckle (偷笑) when you're hurt, but laughter helps the body make its own  medicine. Laughing is also great exercise! Research  that laughing 100 times is as good as riding a bike for 15 minutes.

So why don't you try laughing out loud every day?

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What color is a tennis ball? Ask your classmates, and they might give you some  answers.

The Atlantic asked 30, 000 people this question. Among the people surveyed, 52 percent said tennis balls are green, 42 percent said yellow, and 6 percent said  else.

According to the International Tennis Federation, tennis balls  yellow. So, why do most people say that they're green?

When we  see an object in natural light, our brains recognize its true color. Even if the object in different kinds of light later, our brains can still tell its true color.  call this color constancy (色彩恒常性). For example, we know that China's flag is red. When we see it during sunset or under purple light, we still know that it is red, even if it looks like a different color.

However, the color of a tennis ball is not as pure (纯的) as the flag. It appears to be a mixture of yellow, a "warm" color, and green, a "cool" color.

The US-based magazine says that when  brains try to figure out what color the ball is, some people ignore (忽略) cool colors like green, blue and purple. So they see the ball as yellow.  ignore warm colors, such as red, yellow and orange. They see the ball as green.

It is not just tennis balls that make such confusion. In 2015, a girl  a picture of a dress online. Some people said the dress was black and blue  other people said it was gold and white. They had different opinions based on whether they ignored cool or warm colors.