Stories on Stage: Audio of short stories online

Chicago Public Radio has its series of short stories read by actors, Stories on Stage, available online. It’s quite an impressive list of stories and includes some of Camella C.’s favorites:

The series does not seem to extend beyond 2007 but there are quite a number of stories going all the way back to 2001. It’s great to hear these stories well read, and to recognize that the rules for reading prose out loud are very similar to those for poetry.

Hat tip to Anna C. for pointing this out to me.

Federal Reserve’s economic data

The St. Louis Federal Reserve has a Summer School program for teachers. Two of the sessions deal with current events (banking crisis and jobs) but the third covers the data and primary source documents that bank makes available online (for free). These include the FRED and GeoFred websites.

Unemployment data for the Eastern US from GeoFRED.

GeoFred produces graphs like the one above showing economic statistics across the country. It can do it on a state by state basis, by county (as above), or by even more refined areas.

US GDP from FRED.

FRED plots graphs and even provides the data for economic statistics over time. The graph above shows GDP since they started collecting data in the 1940’s. It also has the times of recessions shaded in. The data in the graph can also be downloaded if you want to do your own analysis.

These seem to be handy little tools for teaching and for research projects, and are pretty easy to use.

The teachers’ training sessions are free though you have to get your own housing. They do provide breakfast and lunch. If you want graduate credit for them however, each three day session will cost around $306 and garner one credit.

The SDA

Answers to the question 'Some people say that it is better for a country if different racial and ethnic groups maintain their distinct customs and traditions. Others say that it is better if these groups adapt and blend into the larger society. Which of these views comes closer to your own?' sorted by year in which the respondent was born.

UC Berkley’s Survey Documentation and Analysis (SDA) website has a lot of potential as a research tool for the more advanced middle-schooler. I greatly encourage students to do original research in their semester-long Independent Research Projects. They pose questions, collect and/or analyze data and slog through the challenges of dealing with open ended questions. Middle school is the appropriate time for this as they are working on their formal thinking skills. With the increasing availability of websites like the SDA, everyone can gain access to research grade datasets.

The SDA is powerful because it has a lot of data from survey questions dealing with a large number of survey issues, from race relations, to perceptions of the economy, to use of the web. But with that power is a certain degree of complexity. It took me a while this morning to decipher the web interface and I’m no where near plumbing all the nuances of the statistical analysis, but it’s not too hard to do some basic plots.

Right side of the SDA webpage.

On the left side of the window is a list of all the survey questions available. There are a lot but they each have the full question so it’s pretty easy to figure out what they mean. When you select one, such as the opposition to a family member bringing home a black/negro friend for dinner, it gives you the little code, “RACDIN” in this case that you enter as the Row on the right side of the window (see the above figure). Now I want to know how people’s answers to that question changed based on how old they are, so for the Column option I put in “AGE”. Of course what I actually put in is “AGE(c:10,1)” which tells the program to lump all the age data into 10 year sets, starting at age 1.

Answer to the question, 'How strongly would you object if a member of your family wanted to bring a (negro/black) friend home to dinner?' sorted by age of the respondent.

Students will certainly need help getting started, and I could add video instructions if anyone wants it.

Now comes the most interesting part, interpreting the graphs. I like the plot at the top of this post for this reason. It shows that the younger people are the more likely they are to think it’s better if racial and ethnic groups maintain their customs and traditions. Does this mean that younger people have more racist attitudes, trying to maintain separation, or does it mean that they are more accepting of different cultures?

Waves and interference

There are lots of interesting interactive wave demonstrations on the web. The particularly interesting ones are the ones that show interference. Some of them make your eyes water. Others make your ears hurt. These simple animations show superposition (constructive and destructive interference) very nicely, but the language is a little advanced.

What I like about Dan Russell’s 2d animations is that they show the wave motion using particles. If you track a single particle with your eye you can see that while the wave moves from one side of the area to the other, the particles just move back and forth in the same general region.

Longitudinal wave
Longitudinal wave (from Russell, 2001).

I like this demo because you easily control the wave amplitude and lengths of two waves and it shows how they superimpose.

This animation of wave interference is nice because when you click on the 2d animation it shows the two waves’ effects at the point you’ve chosen as curves. You can choose points to show both constructive and destructive interference.

Constructive interference (screen capture from animation by Ng (Retrieved 2010)).

Destructive Interference (screen capture from animation by Ng (Retrieved 2010)).

This elegant but somewhat complex video shows the two dimensional sine waves generated by a rotating wheel.

Sine waves from a rotating wheel (from animation at Russell Kightley Media)