VIEWING
Why is yawning contagious?
为什么打哈欠会传染？
In the previous part, you have learned the characteristics of science which seem to be abstract and complicated. However, if you observe the world around you carefully, you will find that science is everywhere in your daily life. For example have you ever yawned because somebody else yawned? Do you want to know why it happens? Watch a video clip to see how scientists explain some hypotheses although they still don't fully understand why it happens.
在上一部分中，您已经学习了抽象而复杂的科学特质。但是，如果您仔细观察周围的世界，您会发现科学在您的日常生活中无处不在。例如，您是否因为其他人打呵欠而打过哈欠？您想知道为什么会这样吗？观看视频片段，看看科学家如何解释某些假设，尽管他们仍然不完全了解为什么会发生这种情况。
READING
Discovering science in daily life
发现生活中的科学
Just as there is science in contagious yawning, there is science in a cup of coffee. If you are a coffee drinker, here is a question for you: Have you ever wondered why, when you spill a drop of coffee on your table, there is always a ring of dark stuff at the outer edge after it dries? Mysterious but interesting, isn't it? Read the following text, and scientists will tell you how it works.
正如传染性的打哈欠有科学一样，一杯咖啡也有科学。如果您是咖啡饮用者，那么这里有一个问题：您是否曾经想过为什么当您将一滴咖啡洒在桌子上时，干燥后的外边缘总是会有一团黑东西？神秘但有趣，不是吗？阅读以下文字，科学家将告诉您其工作原理。
