Position the Bottles: Hold one bottle firmly in one hand. With the second bottle, position the cap under the first bottle’s neck. Leverage the Bottles: Use the first bottle’s neck as a lever and pry ...

It's a bit hard to see, but the thermometer reads 77.7 degrees on the left (dry hat) and 54.5 degrees on the right (wet hat). The test was done with room temperature water on a 90-degree day.