What is the diffirent between "effective" and "efficient" ?

Do you think sports are able to bring enemies together ? My friend gave me this question yesterday and she required me to write a paragraph ( from 150 to 200 words ) to express my opinion of the idea that sports are able to bring enemies together. I think this is possible but I have not found any persuadable ideas to support it. Could you give me some suggestion or show me your opinion of it ? Thank you :D

Conservation hour in U.S.Embassy Hanoi Today, I had an interesting conservation hour in U.S.Embassy Hanoi, Vietnam. Our topic today was about Christmas because it's coming nearly ! There were a lot of special guests joining with us today. They are students from Marie Curie International Primary School. They are so adorable and obedient :) At the begining, we watch a famous movie about Christmas. Oneil, our leader, told me that not only American children but also adults watch that movie every Christmas as it reminds them about their childhood. This movie was about a green guy who didn't like Christmas at first. So he dressed as if he were Santa Claus and made up his poor dog as a reindeer. Then they came to the village in the valley on they sled to stole all the food, decorator and presents that villager had prepared for Christmas since they thought this might help to stop everyone celebrating this holiday. After that, they came back to the mountain but surprisingly, when the green guy looked down to the village, he saw people singing christmas song joyfully and enjoyng the merry atmostphere together. While he heard Christmas songs, there was something strange happening to him and suddenly, he changed his mind and found the meaning of Christmas. Finally, he came back to the village and gave back all the things he had stolen and enjoyed Christmas dinner with people there. I found this movie meaningful athough there were not any real word in it apart from sound. After that was our conservation time. There were various interesting questions and answers about Christmas and everything relating with it that we could think about. Taking part in this event gave me good chance to improve my English and make friends with many lovely people :)

My little brother He is the most precious present I have ever had :)