One of my colleagues shared a unique news story about using Google Earth for research. It seems birds are not the only animals who sense the magnetic field of the Earth. Researchers looked at the orientation of cows when they were grazing or resting using imagery from Google Earth. Here's a link to the article:
Maureen (MO) Friese and I presented this past spring at Harrison at the workshops there. If you'd like to learn how to use this rich source of primary data with your students, please feel free to contact me directly. You can find me in GroupWise as Herman Wood.