전기차 소리
Electric vehicles are also known for not producing another kind of pollution -- noise. They run on batteries instead of fuel, and can operate in silence.

지하수
The Earth is losing some of its major freshwater supplies. But these water resources are not lakes or rivers. They are called “aquifers.” They formed deep underground as the Earth developed.

피부
Today we explore the human body. Specifically, we take a tour of our largest organ: the skin. Skin is not only large; it is important.

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."

크레용
Hi, my name is Andrew Bracken and I'm six years old. I like to draw neighborhoods and cities. Right now I'm drawing an ice cream store. My favorite crayon colors are: pink is my first, purple is my second, blue is my last.

그것 참 안됐구나
Are you ready for our first soccer game next week. Actually, I’m not. I sprained my ankle yesterday so I will not be able to participate.

행운을 빌다
Today, we talk about the word “knock.” To help explain expressions using “knock,” you will hear scripted dialogues.

녹색
Green is an important color in nature. It is the color of grass and the leaves on trees. It is also the color of most growing plants.

잠
Sleep. It’s important to our mental and physical health. From a quick cat nap to long, deep beauty sleep, we have many expressions to describe sleep.

의사와 간호사
Whenever there is a health crisis, two groups of people can bring help -- doctors and nurses.

고자질하다
Hey, Jason. Why is your son crying? Well, it’s because his best friend ratted him out to the teacher.

롯데 월드 타워
The fifth-tallest building in the world, the Lotte World Tower, has opened in Seoul, South Korea. The event was celebrated in a ceremony with a fireworks display that lit up the building and the sky.

숨 돌리는 곳
If you are feeling nervous or stressed, a simple thing can help. A deep breath.

가장 긴 영단어
The Oxford English Dictionary Web site says the longest word listed in Oxford dictionaries is this one: “pneumonoultramicroscopicsilicovolcanoconiosis.” This forty-five letter word is the name of a kind of lung disease.

돌부처
A stick in the mud is a boring or uninteresting person. They do not try anything new. They are not willing to take a risk.

길가의 명소
Road trips have been popular with Americans for almost as long as their love of cars. But when gasoline prices are high, people abandon the highway.

봄에는 앞으로 가을에는 뒤로
Americans continued to set their clocks one hour ahead in the spring and one hour back in the fall. They remembered to do this with the expression: "Spring ahead and fall back."

밤샘 공부
Sleep expert David Earnest often tells college students that a good night’s sleep is important for academic success. Not that they listen to him.

관계가 있다
Jen: What do you look forward to the most in the month of October?

휘파람 언어
The United Nations is calling for urgent action to protect a whistled language used in a mountainous area of Turkey.