1. surface tension 4. 1 toothpick per student 5. 3 eye droppers per group of four 6. They are to discover all they can about Red Drop. Properties can be listed in journals or on the chalkboard.
Big drops swallow little ones.
It has no smell. After sufficient time is given for experimenting, tell the students to place a drop of green liquid on their papers. Allow time for discovery. You can't pull it around. It's no fun.