This hack is a must-do. The guy from Teravolt built a microscope with a simple 250mW laser and a syringe. What he did, is he put water in the syringe, and let only a small drop to go out of the needle, but the drop hanged there under, almost ready to fall. Then he put the syringe in front of a laser beam and tadaaa! Go to his page for more info.