Gummi Bears

This lab never ceases to fascinate the students.  We soak a Gummi Bear overnight in cold tap water and then observe the results.  I use this lab to teach the difference between qualitative vs. quantitative data. 
Someday, I hope to have a group of students who will investigate the reactions in other liquids.  I would love to know how they react in Kool-aid, salt-water, etc.

Drops on a Coin

One of the labs I am using to teach scientific method with this year is called "Drops on a Coin."  In this lab students design their own experiment to compare the number of drops of water that can be contained on a penny to the number on a nickle.  I allowed the students to come up with their own procedures which proved interesting, as some students didn't elaborate much at all on how to get the drops on the coins nor did they allow for repetition.  How do you teach scientific method?