This is my favorite microscope lab because the students really get to see organisms swimming around in the water. I ask the students to bring in water samples from water sources around their neighborhood. Make sure to tell them that you don't want a water sample from the gutter. I have a digital microscope that I use to project the images on my overhead screen. There is nothing better than seeing a 3 foot long mosquito larva projected on the overhead screen!!! This activity supports Grade Seven California State Science Standard 7A - Select and use appropriate tools and technology (including calculators, computers, balances, spring scales, microscopes, and binoculars) to perform tests, collect data, and display data.