1. 文科段子：艺术类音乐
It may seem strange that we're discussing music from a Broadway production in this class, "The Lion King" especially, since it's based on a popular Hollywood movie. I mean music preformed for Broadway theater in the heart of New York city surely would seem to be in the western tradition of popular music and not have much in common with the music we have been studying in this course, such as gamelan music of Indonesia, or Zulu chants of South Africa, music that developed outside the western tradition of Europe and America. But in fact, musicians have a long-standing tradition of borrowing front one another's cultures. And this production's director intentionally included both western and non-western music. That way, some of the rhythms, instrument, and harmonies typical of non-western music contrast with and complement popular music more familiar to audiences in North America and Europe, music like rock, jazz or Broadway style show tunes. So I want to spend the rest of this class and most of the next one on the music from the show "The Lion King" as a way of summarizing some of the technical distinctions between typical western music and the non-western music that we've been studying. Now the African influence on the music is clear. The story takes place in Africa. So the director got a South African composer to write songs with a distinctly African sound. And the songs even include words from African languages. But we'll get back to the African influence later. First let's turn to the music that was written for the shadow puppet scenes in "The Lion King", music based on the Indonesian music used in the shadow puppet theater of that region
2. 理科段子：天文学
In ancient times, many people believed the earth was a flat disc. Well over 2,000 years ago; the ancient Greek philosophers were able to put forward two good arguments proving that it was not. Direct observations of heavenly bodies were the basis of both these arguments. First, the Greeks knew that during eclipses of the moon the earth was between the sun and the moon, and they saw that during these eclipses, the earth's shadow on the moon was always round, they realized that this could be true only if the earth was spherical, It the earth was a flat disc, then its shadow during eclipses would not be a prefect circle; it would be stretched out into a long ellipse. The second argument was based on what the Greeks saw during their travels. They noticed that the North Star, or Polaris, appeared lower in the sky when they traveled south, in the more northerly regions, the North Star appeared to them to be much higher in the sky. By the way, it was also from this difference in the apparent position of the North Star that the Greeks first calculated the approximate distance around the circumference of the earth, a figure recorded in ancient documents says 400.000 stadium, that's the plural of the world stadium. Today, it's not known exactly what length one stadium represents, but let's say it was about 200 meters, the length of many athletic stadiums. This would make the Greek's estimate about twice the figure accepted today, a very good estimate for those writing so long before even the first telescope was invented.
3. 文科段子：文学名着
Continuing our survey of the 19th century, let's take a look now at Harriet Beecher Stowe. Now Stowe is best known for her novel Uncle Tom's Cabin, a book that details the harshness of plantation life in the south. The book was extremely popular in the United States as well as in other countries. Ironically though, for all the attention given to Uncle Tom's Cabin, it's far from Stowe's best work. She did write one other novel about life in the south, but much of her best work has nothing with the south at all. In fact, Stowe's best writing is about village life in the New England's states in the 19th century. In recording to the customs of the villages she wrote about, Stowe claimed that her purpose was to reflect the images as realistically as possible. She usually succeeded, for her settings were often described accurately and in detail. In this sense, she was an important forerunner to the realistic movement that became popular later in the 19th century. She was one of the first writers to use local dialect for her characters when they spoke. And she did this for 30 years before Mark Twain popularized the use of local dialect. It makes sense that Stowe would write about New England life, since she was born in Connecticut. As a young woman there, she worked as a teacher. The teaching job helped lead to her first published work, a geography book for children. Later when she was married, her writing helped her support her family financially. Throughout her life, she wrote poems, travel books, biographical sketches and children's books, as well as novels for adults.
4. 生活段子：噪音影响
I'm grad to see so many of you here. We've become really alarmed over the health center by the number of students we are seeing, who are experiencing hearing loss. First, I want to go over some basic about hearing. Then we can take a look at our school environment and see if we can figure out some ways to protect hearing. The leading cause of preventable hearing loss is excessive noise. Too much moderate noise for a long time or some types of intense noise for even a short time can damage hearing. Loudness is measured in units called decibels. One decibel is the lowest sound that the average person can here. Sounds up to 80 decibels generally aren't harmful. That's noise like traffic on a busy street. But anything louder than 80 decibels, especially with continuous exposure, may eventually hurt your hearing. Once you are up to around 140 decibels, that's like a jet plane taking off, then you might even feel pain in your ears. And pains are sure sign that your hearing's at risk. Even one exposure to a really loud noise at close range can cause hearing loss. So what you need to do is limit your exposure to harmful levels. If you pass along this handout, we can take a look at the decibel level of some common campus sounds. Notice how loud those horns are that people take to football games. They are really dangerous if blown right behind you. Now, let's try to generate a list of damaging noises
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