About 20 years ago, I was on trans-oceanic flight. Coffee was served at some point in the flight, and I am convinced the steam coming off the beverage, along wi

About 20 years ago, I was on trans-oceanic flight. Coffee was served at some point in the flight, and I am convinced the steam coming off the beverage, along with the higher altitude created a cloud chamber in front of me. While the coffee cooled, there were very distinct cosmic ray patterns within the steam that I cannot come up with any other explanation for.