맨발로 달리기
They found that running shoes create more stress that could damage knees, hips and ankle joints than running barefoot. They observed that the effect was even greater than the effect reported earlier for walking in high heels.

언어와 두뇌
A new study of the brain is helping scientists better understand how humans process language. The study is being done in San Diego, Boston and New York.

86?
Most dictionaries say the term "eighty-six" comes from employees in the restaurant industry. It means the restaurant has sold out of something.

시간
If you can read a clock, you can know the time of day. But no one knows what time itself is. We cannot see it. We cannot touch it. We cannot hear it. We know it only by the way we mark its passing.

외로움도 전염된다
A newly-published study has shown that loneliness can spread from one person to another, like a disease.

청바지
Jeans are pants made from a kind of cloth called denim. For many people, blue jeans represent American culture.

암벽 등반
An estimated nine million people rock climb in the United States. Millions more take part in the activity around the world. Some do it just for personal satisfaction. Others compete. Rock climbing can be dangerous.

뉴욕 센트럴 파크
This outdoor area is more than three hundred and forty hectares. It was the first public park built in the United States.

샤워 꼭지에도 균이
We all have heard about harmful bacteria hiding in the home. Studies have discovered evidence of harmful bacteria in toilets, on surfaces where food is prepared, even on home telephones.

영화 대여 서비스
Netflix is the world’s largest online movie rental service. It started in nineteen ninety-eight. It now has ten million paying members in the United States.