One of my most vivid memories of high school was observing a slime mold in a petri dish under a microscope in biology class. It was fascinating to watch the liq

One of my most vivid memories of high school was observing a slime mold in a petri dish under a microscope in biology class. It was fascinating to watch the liquid inside the tubes of the slime mold flow in one direction, then stop and flow in the opposite direction. You can see that behavior in this video clip: https://www.youtube.com/watch?v=elqwn7k2Wwk&t=451s https://www.youtube.com/watch?v=elqwn7k2Wwk&t=451s At elapsed time 7:49, the flow stops and reverses. The rest of the video, which is entitled "Slime Molds: When Micro Becomes Macro", is interesting as well.