I had the pleasure of seeing Cherenkov radiation in person when I had the opportunity to tour Penn State’s research nuclear reactor years and years ago. We walked through the reactor room where you were able to look into the depths of the “pool” that the fuel rods were in. You could see boiling water bubbles floating up off the rods and a bright cyan glow coming from the rods rather than the green we’re so accustomed to from the Simpsons. If I wanted to, I could have dove into the water and swam down to the rods. Easily the craziest intrusive thought I’ve ever had.