What Shape is a Bubble?

We started with a question, then students 
hypothesized using their previous knowledge.

They did an investigation. I gave them a
formula, then they used measuring cups
and a graduated cylinder to make a solution.

They used a magnifying lens to examine their bubbles, then we had a discussion.
 DSCF1507  DSCF1508
 DSCF1514  DSCF1510
 DSCF1512  DSCF1522
 DSCF1511  DSCF1517
 DSCF1523  DSCF1519
 DSCF1521  DSCF1516