Tuesday, September 20, 2011

Noon Day project measurements begin this week- September 19, 2011

Carl Sagan tells the story (6.5min)
The Goal of the Noon Day Project is to have students measure the circumference of the earth using a method that was first used by Eratosthenes over 2000 years ago. Students at various sites around the world will measure shadows cast by a meter stick and compare their results. From this data students will be able to calculate the circumference of the earth.
Doing the measurements
Follow me on Twitter (Hashtag #noondaymeasure) as I recreate the experiment that Eratosthenes did. I hope to do my measurements on September 22 weather permitting.
There is some good background material on the measurement at the Noon Day project site hosted by the CIESE (Center for Innovation in Engineering & Science Education) - Stevens Institute of Technology in Hoboken, NJ.

Thursday, September 15, 2011

Brother, can you spare a quarter (or something like that?)

          Misconceptions revisited...

How much do the pencils cost?

Saturday, September 10, 2011

Two different versions of the same thing?

Example from mathatube.org (2:19)

Video makes it more interesting. Right? Wrong.. It's still boring....