지구
The world celebrates Earth Day every year on April 22. It is a day to think seriously about how our lifestyles and daily habits affect the earth.

하이퍼루프
In the United States, a company is working on a project that could change the way we think about public transportation. Its planned system would move people around in steel tubes.

핫도그에서 애플파이까지
A hot dog is usually made from pork, the meat of a pig. Or it is made from beef, the meat of a cow. Another version is made from turkey. A vegetarian version of a hot dog has no meat at all.

성공한 사람의 5가지 습관
Having success and being able to meet one’s goals requires knowledge, a sense of direction, hard work and resources.

잠수 타다
Alice! I haven’t seen you in such a long time. You’ve been MIA for a while. I know. I’ve been MIA. I’ve been studying for the real estate license test.

의사가 뭐라 그래요?
What did the doctor say? He said I need to bring my cholesterol level down.

평생 운동
If you have been meaning to add more exercise to your daily routine, you may want to start sooner rather than later.

나중에 후회하는 것보다 조심하는 것이 낫다
Sara: I’m washing my hands. Better safe than sorry right? Jen: Oh yea, that’s true.

라라 랜드
Today we talk about expressions involving Los Angeles, California. Los Angeles is the biggest city in the western United States.

대학 논문 쓰기
Strong writing is one of the most important skills for any college student. Many non-native English speakers have no idea what professors in the U.S. expect from a college paper.

화성에서 감자를?
A year later, scientists in Peru and NASA scientists in California started working together on growing potatoes in a harsh location similar to Mars.

글쓰기와 웹
Web browsers first appeared on computers in the early nineteen nineties. Since then, the Internet has greatly changed the way people communicate. But some teachers think the changes are not all for the better.

발을 들여놓다
Jen: You know, a lot of people come into DC as someone who is fresh out of college or fresh out of grad (graduate) school even…to get their foot in the door right?

바퀴
Today we explore expressions using the word “wheel.” The first wheels, it is believed, were not used for transportation. They were created to serve as potter’s wheels around 3500 B.C. in Mesopotamia.

졸리운 아이들
Surveys of American teenagers find that about half of them do not get enough sleep on school nights. They get an average of sixty to ninety minutes less than experts say they need.

승진하다
Ladders are made from two long pieces of wood, metal, or rope with a series of steps, called rungs, between them.

매우 쉬운 일
Clara: Hey! How did you do on the exam? Ellie: I got an A. The exam was a piece of cake.

카우보이
Experts say that men came from all over the United States to work as cowboys in the West. Cowboys were excellent horse riders. They trained wild horses. They used rope to catch and tie runaway animals.

배터리 없는 휴대폰
Researchers have built a cellphone that does not need batteries. They say the phone can send and receive calls using power from radio signals or light.

100살 넘은 사이클 선수
World records can be set even if you are over 100 years old. Robert Marchand was born in 1911 in northern France. He enjoys riding a bicycle, and started cycling seriously when he was in his 60s.