11
손을 자주 씻어야 하는 이유
Medical experts say the most effective way to prevent the spread of disease is for people to wash their hands with soap and water.
8
개도 꿈을 꾸는가?
Studies show that dogs and human beings have similar brain activity when they sleep. Researchers use a test called an electroencephalogram to study such activity.
7
미국 유학생
This week, we report comments from foreign students in the United States who have experienced the process we have been describing.