SKYPE resources needed or some Ideas?

I am a third grade teacher and am setting up another Paperless Day, since our first trial went so well. I was able to arrange for a local museum to SKYPE call into our room that day to share knowledge on a particular Science topic and we were very fortunate that they did this at no charge ! :-).
I am looking again to try and set up a SKYPE call from a scientist in the area of Motion, Forces, & Energy or a classroom visit. I have some contacts going, but have not heard anything yet. I was just seeing if anyone knew of any other resources to try. Location just outside of Chicago, Illinois.

I was also thinking of trying to find a contact that could tie in with our research of Women in History, since that will be a focus in March.

Overall goal is NO PAPER :-) Worked first time round and I am sure it will the 2nd time around. If anyone has any suggestions, I would greatly appreciate it.

Thanks,
Jen

**Or if you are a school and would like to SKPYE call about a prearranged topic or activity, I would be open to that too. ***