Wow, this a great resource for after school science programs.
If you are pressed for time like we are, Mystery Science is just the resource for you. The content, handout, prep lists are stellar and the units are brief. However beware, it appears that Myster Science rotates their units. For instance, Melissa M. from Staten Island used unit #9: What would life be like without machines? in here lesson plan which was post February 2016. It is April and the unit is no longer listed.
How I Use It
We plan to use during our Saturday and after school science clubs.