He likes to his parents.

    Many people may sometimes wish it could be summer all year round. However, as nice as summer is, we really need the other seasons as well.

    Then why do we have different seasons? We know that the Earth spins on its own axis (轴线). This makes day and night. In 24 hours the Earth turns round once. When we are facing the sun, it is day. When we face away, it is night. Simple!

    We travel around the sun in a circle. So why does it get colder in winter and hotter in summer? It's because the axis of the Earth is tilted (倾斜的). It means that in summer some places, such as the UK, are leaning towards the ssun. The temperature rises. As the Earth travels around the sun, these places begin to tilt away and the temperature drops. It becomes winter.

    This is why when the UK has winter, Australia has summer. Imagine having Christmas dinner on the beach! But not all countries have seasons. Countries near the equator (赤道), the line which goes round the middle of the Earth, don't have different seasons. The weather stays almost the same temperature all the year round. Can you think why this is? The middle doesn't tilt very much, does it? This means the seasons don't change much.

    Then what about the North and South Pole? What are the seasons like there? Because they get very far away from the Sun, their seasons are very extreme. There are only two seasons near the North and South Pole: winter and summer. What's more, they only have one sunrise and one sunset a year. It is dark for six months of the year and light for six months of the year. What problems would there be if you had to live somewhere that was dark for six months of the year and light for six months of the year?

Alice Hou, started Girls in STEM club (俱乐部) in America, tries to help more girls interested in science, technology, engineering and math.

Do you know Girls in STEM? It's a club for girls. They can learn science here. Alice Hou, a 16-year-old girl from the US, set up (创立) the club.

Alice loves science, and now she learns computer science at the University of North Texas. She is also good at Chinese dance, and she won the title of Miss Arlington's Outstanding Teen (阿灵顿杰出少年). "When I'm dancing on the stage, I just feel relaxed, "Alice said." But I feel worried (担心的) when I have my science lesson. There are 100 students in my class, but only 11 are girls. "To help more girls to be interested in science, Alice set up STEM. Now, a lot of girls are in the club. They often come to the club after school. In the club, they can learn science by playing interesting games. They can also talk about the school subjects with their friends.

People in the US like this club. Now many schools have the same clubs. They want more girls to love science.

I'm the math test.

your school trip?

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—No. She learns English by____.