Where does the wind come from? What makes the wind move(移动) all the time? Scientists tell us that it is the sun. That makes air move, and makes it blow(吹). When the sun shines on the earth, it makes the earth hot. Then the earth makes the air hot. When the air becomes hotter, it also becomes lighter(更轻). The light air goes up. Cool air comes into take the place of（代替） the hot air. The hot light air goes up higher and higher until it becomes cool. Then it comes down again, and then the earth makes it hot again, and it has to go up. When the air move, it has wind.

    Have you ever had trouble sleeping in a new place?

    Lots of people do. And now researchers from Brown University in Rhode Island think they know why. They found that one-half of the brain "remains more awake" than the other half when people are trying to sleep in a new place.

The sleep findings were reported in Current Biology by Brown University. In their report, the researchers said many people report they have a harder time sleeping the first night at a hotel or other places outside their home. They call it "first-night influence". "In Japan they say, 'If you change your bed, you can't sleep,'" said Yuka Sasaki, one of the report's writers. "You don't sleep very well in a new place. We all know about it."

    The researchers measured brain waves (测量脑波) for 35 volunteers over two nights in a laboratory. The two nights were a week apart (间隔). They found during the first night the left half of the brain was more active than the right half. This was during the first deep-sleep period, the researchers said.

    Sasaki said a lot of questions remain.

    Researchers did not keep measuring brain waves all night long. So, they don't know if the left half keeps "watch" all night, or whether it "works in shifts (轮换) with the right half later in the night". They also do not know why the brain activity, at least during the first period of deep sleep, is always on the left half.

    For some, this research may be calming. It is good to know that our brain is "looking out for us" in a new place. But it may not help with sleep. That brain activity, at least according to this new research, makes it harder to get the sleep people need to wake up well rested in the morning.

Hi! I'm Gina. This is my friend, Lily. And these are the photos from her. 

{#blank#}2{#/blank#}

This is a photo of her family. They are her parents. The boy is her brother. He is a student, too. 

{#blank#}3{#/blank#}

It is big and tidy. Only 15 desks and chairs are in it. The big desk is the teacher's. On it you can see four books. They are the teacher's, too. 

{#blank#}4{#/blank#}

Frank is its name. It is three years old. But it's very small. It is white and black. She plays with it every day. 

{#blank#}5{#/blank#}

Look! Some things are on her desk. The red pen is from her brother. And the red skirt is from her grandparents. She likes them very much. 

Mr. Smith is on a trip to the famous zoo in Solvang and he stays in a nice hotel. These are the front and back sides(正反面) of Mr. Smith's hotel room card. 

Many people enjoy watching movies in a cinema. They think the cinema has a better atmosphere（气氛）to enjoy the movie. However, I think people are happier and freer when watching movies at home. 

Watching movies at home is more comfortable. To watch movies in a cinema, you have to buy a ticket before you go there for a better seat. However, there is no need for people at home to worry about the ticket. They can enjoy movies at any time they like and with the most comfortable seat. What's more, people watching movies at home wouldn't have to face any traffic problems. 

It is free to watch movies at home. In the cinema, we can't go outside and do something else because the movie won't wait for us. Sometimes we miss part of the movie. At home, we can pause（暂停）at any time and go back to watch the part. 

All in all, a cinema is a good place to watch movies, but it isn't the best place to enjoy the movies. I think watching movies at home is better. 

Do you often leave your keys at home when you go out? Or, do you often keep your TV or computer {#blank#}1{#/blank#}when you don't use them? However, in the near future, we will live in smart houses {#blank#}2{#/blank#}. These houses are better than many apartments now. And they will make our life much {#blank#}3{#/blank#}. When we leave home each morning, the TV and computer will turn {#blank#}4{#/blank#}off. When you get home each evening, everything will be ready. It's pretty cool. However, people will do less exercise, scientists suggest everyone {#blank#}5{#/blank#} playing sports in the future.