582
천연비누 만들기
While washing your hands have you ever wondered what materials are in a bar of soap and why it cleans? Today we answer that question with a visit to a soap maker at her home in Falls Church, Virginia near Washington.
581
우주 청소기
It may be the world’s most costly vacuum cleaner. The price of CleanSpace One is eleven million dollars. But yet, it has a big job to do. Recently, researchers in Switzerland announced plans to build this new cleaning device.
578
콜레스테롤
A study has raised questions about a widely held belief involving cholesterol. The belief is that high levels of so-called good cholesterol in the blood can reduce the risk of a heart attack.
575
프로처럼 와인 맛보기
If you know how to study a glass of wine, it can tell you about its history. Studying a wine involves using several senses, not just taste.
571
더러운 것이 아이 몸에 좋다?
A new study suggests that early exposure to germs strengthens the immune system. That means letting children get a little dirty might be good for their health later in life.
570
지프
The American Bantam Car Company designed and built the first American military jeeps. And it did so in record time. In the summer of nineteen-forty, in just a few days the company created a complete design.
568
영화 제작팀
He wants to know more about the many jobs listed in small print in the credits at the end of movies. Some of these jobs have funny names -- like boom operator.
567
빈지 드링킹
The National Institute on Drug Abuse says forty-two percent of young adults in America have taken part in what is known as binge drinking. The experts define that as drinking four to five drinks within about two hours.
565
야외 음식 안전한가?
Disease-control officials estimate that about one in six Americans get sick from food each year. One hundred thirty thousand have to go to a hospital for food poisoning.
562
아이비 리그
The Ivy League is a name for eight schools in the northeastern United States. All but one were established hundreds of years ago, when England had colonies in the area.