Sports can help us a lot. Taking exercise can make us strong. In collective(集体的) sports like basketball, volleyball, or football, we will learn the importance of cooperation. And sports can also help us relax after work or study.

However, as the saying goes, "There are two sides of everything." Sometimes we may hurt other players or ourselves if we are not careful enough when participating(参加) in sports activities. What's more, too much or hard practice can be bad for our health.

    Sports can make us healthy both physically and psychologically(心理地). It is also a good way for people to know each other and can improve friendship between people. So long as we are careful enough, sports can do us nothing but good.

    As a first grader, the last thing on Kylie' s mind was to be an inventor (发明家) . When she made a board game (棋类游戏) about Ladybug (瓢虫) for her science class, the student from Pleasanton, California, thought it would just make her homework fun. Now her board game the Ladybug Game goes into many stores in America. Kylie is happy to talk to WR News about her invention.

(WR=WR News; K=Kylie)

WR: How did you get the idea for the Ladybug Game?

K: I just did it for Mrs. Ditto's science class. We had to make something to tell our classmates about insects (昆虫). I really like board games and I play them a lot. So I made a board game myself.

WR: Why ladybugs?

K: I like their colors. Ladybugs come in many different colors. And I think they have a cool life cycle (生命周期).

WR: Your dad took your game to a friend and the friend helped more people know it. How did you feel when you heard that going to sell your board game?

K: It was really cool. When I got into some stores sometimes the people said "You're the girl on the box!"

WR： Do you think you will invent some other things someday?

K: I don't know, but I'm sure that it will be fun.

Information Card

   In thetime it takes you to read this sentence, the population of the Earth will have grownby 10 people. That may not sound much, but it is about 14,000 people an hour. Thatis the same as adding most of the population of Germany to the world every year!

   Most of these new people are born in developing countries. These countriesare found in much of Africa, South America, and parts of Asia. In the developedcountries of Europe and North America, the population is growing very slowly. Thisis because women in these countries have, on average, only one or two children.In the developing countries, many women have five or more children. In 1950, aroundone quarter of the world's population lived in the developed countries. By 2050,these countries will be the home to only around one tenth of the world's people.

   In the developing countries, more than one billion people already live belowthe poverty line (贫困线).These people don't have enough food to eat and they live in poor housing;children get little or no time at school and suffer from many kinds of diseases.

   The United Nations (UN) tries to guess population growth. At the beginningof the 21st century, the world's population was around six billion people. The UNhas said that the world's population will level off at 12. 5 billion people by theyear 2100. Other people think the world's population will continue to grow, reaching14 billion people before it becomes stable or even falls.