Weekly Science Challenge: Finding aquatic insects

Aquatic macroinvertebrates, or small insects that live in water, can tell us a lot about the health of the waterway. These "indicators" can only live in clean water, so we were thrilled to find a bunch of them this week. Are more of them found in fast or slow running water? We'll show you how to test that question.

Each Thursday we'll bring you a new challenge. Watch the challenge then do the activity on your own! We want to see your findings, so use the hashtag #HSIWeeklyChallenge to show us your work on social media.

Thank you to the Villager Nursery in Truckee, California, a long-time sponsor of our educational programs.