The document discusses how people's behaviors change depending on whether it is hot or cold outside. When it is cold, people drink hot drinks and wear warm clothes to stay warm, and stay inside. When it is hot, people drink cold drinks, wear cool clothes, go to the beach to swim, and eat different types of food. It also explains that ice cream melts in the sun because the sun is warm and ice cream is cold, and that ice forms when it is very cold outside.