Here's an interesting website with a number of activities (mostly physical setting, no life science). Its called the Schlumberger SEED. Check out the "Brazil Nut Effect" (why does it seem that there are always a lot of Brazil nuts on top when you open a can of mixed nuts?). There are teacher notes to each activity to provide additional details. Thanks to Justine Papierski for the link.

Mike

-- Michael Gatton (mwgatton@hotmail.com), February 04, 2001