You can measure the temperature inside your refrigerator without putting a thermometer inside. Take a can of soda from the refrigerator, let it warm for 30 minutes, then record its temperature. Let it warm for another half an hour and record the temperature again. Suppose the first temperature measurement at 30 minutes is 58°F and the second temperature at 90 minutes is 70°F. Assuming that the ambient room temperature is 72°F, what is the temperature inside the refrigerator? (Answer: 35 degrees Fahrenheit)