보석 세공
Ancient peoples who lived near the ocean used the shells of sea creatures to make jewelry. Other ancient peoples used materials like small colored rocks and animal bones and teeth.

눈
Snow is a form of frozen water. It contains many groups of tiny ice particles called snow crystals. These crystals grow from water particles in cold clouds.

시어스 타워
The Sears Tower in Chicago, Illinois, is the tallest office building in the United States. It was built between nineteen seventy and nineteen seventy-four. For more than twenty years, it was the tallest building in the world.

가격할인 세일
When a store sells goods or services at a cost lower than usual, it is called a sale. Sales last for a limited time. Then the cost is returned to its usual amount.

미국 유학생이 가장 많은 나라
More than five hundred sixty thousand foreign students attended an American college or university during the last school year.

새해 결심
January first. The beginning of a new year. As far back in history as we can tell, people have celebrated the start of a new year.

단풍나무 시럽
Paul Limberty has been producing maple syrup in Vermont for ten years. The process is called sugaring. Each February, Mister Limberty and his wife, Jennifer Esser, drill holes into their sugar maple trees.

의사 되기
People who want to become medical doctors often study large amounts of biology, chemistry and other science. Some students work for a year or two in a medical or research job...

오줌싸개
The American Academy of Pediatrics says about forty percent of preschool-age children urinate in their sleep.

머피의 법칙
Murphy’s Law is an American expression whose meaning spread around the world. Murphy’s Law says: "Everything that can possibly go wrong will go wrong."