When is a change of state not really a change of state?
Sorry, but this content is reserved for subscribers only.
Your $20/year subscription helps cover the costs of producing new videos, writing curriculum units, site development, and hosting. Without that support, this site would not be possible.
If you are already a subscriber, and having problems logging in, please check the Support Page.
If you are not yet a subscriber, please check out the Free Stuff page, and Subscribe Now.







spinners acre school
hay, robert krampf's experiment of the week#115 is cool.
i rember seeing this one at my school, i hope we hope we see more we've seen nearly evry one. PUT MORE ON PLEASE! PLEASE! PLEASE!
from lianne julia cooksley.
Post new comment