옐로스톤 국립공원
Yellowstone National Park became America’s first national park in 1872. The National Park Service was formed 44 years later in 1916.

이미 벌어진 일이다
Whatever the reason, sometimes we speak when maybe we shouldn’t. And once those words are out there, there is no taking them back.

주인의 스트레스를 느끼는 개
When dog owners experience a long period of stress, they are not alone in feeling the pressure. Their dogs feel it, too.

꿈의 신비
Do you dream? Do you create pictures and stories in your mind as you sleep? Today, we are going to explore dreaming. People have had ideas about the meaning and importance of dreams for hundreds of years.

오해를 풀다
I’m afraid I must’ve done something to hurt Mary’s feelings. She has been so unfriendly recently to me. I told her I wanted to clear the air, but she turned and walked away from me.

레이저
We tell about one of the most recognizable objects in science fiction ? the laser. It is one of the best examples of how technology can go from the science of the future to everyday use in a short period of time.

플라스틱병을 신발로
A San Francisco start-up is using recycled plastic water bottles to create fashionable womans footwear called Rothy's.

아주 처음부터 시작하다
Julie: Hmmm! But not from scratch I’m afraid. We utilize canned pumpkins but we like pumpkin pies.

박사 학위
The highest degree that a student can earn is a doctorate. Some doctorates are professional degrees, as opposed to a degree based on research.

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.

책임을 지다
I broke Sam’s camera yesterday and I still haven’t told him yet. Well, it’s time you faced the music and told him.

동절기 운동
In winter, people might lessen their outdoor exercise. The days get dark earlier, and it can be very cold! These conditions can make it harder for some of us to get outdoors for exercise.

약속을 어기다
You flaked out on me yesterday. We were supposed to have lunch together!

원
A circle is simple and elegant. Mathematicians describe it as 360 degrees traveling endlessly around and around.

하룻밤 자며 잘 생각해야 해
Hey your wife told me that you got a wonderful job offer today. Yes I did but I didn’t decide on taking the job yet. I still need to sleep on it.

유선전화가 줄어든다
According to the latest survey by the Centers for Disease Control, 18 percent of U.S. homes - one in every six - have no traditional, land-line telephone at all. You know, the kind with a handset and a wire leading to a connection in the wall.

빠르게 성장하는 직업들
America’s extremely wealthy population is bigger than ever. And their money is supporting jobs for an increasing number of low-wage workers.

아주 잘 지내고 있어
It's been a while since we've seen each other. It's great to see you! Same here! It’s great to see you too. How have you been?

영작을 위한 개념도
English learners face a common problem: their writing often lacks clarity and cohesion. That is according to Babi Kruchin and Alan Kennedy who teach at the American Language Program at Columbia University.

원정 출산
Every year, hundreds of pregnant Russian women travel to the United States to give birth.