One day during the summer you and some friends made ice cream using an electric ice cream maker. A few days later you noticed a yellow circle of dead grass where the ice cream freezer had been placed. What happened?

Answer: Heat produced from the electric ice cream maker killed the grass

Explanation:

The principle behind refrigeration of the ice cream maker is that

- air from the atmosphere is collected into the condenser,

- it is mixed with refrigerant gases like liquid nitrogen

- then it becomes cool, and freezes the prepared cream to become iced

- then, the HEAT generated during this conversion is ejected from the electric ice cream maker in form of hot air.

This hot air directed towards the grass will kill its living cells, thus it turns yellow over time