Sample from Caltech Turtle Pond

The image shows a Foldscope image of water from the Caltech turtle pond. The sample was obtained on Tuesday 9th April by recitation TAs.

Question: Does the image show organisms on the slide, or dirt or other matter on the lens?
Approach: Check if the spots are moving, or move the slide and see if they remain or move with the slide.

#caltechbi1

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