Hammered by a Heat Wave!

Ambulance driver Michelle Mclnnis raced across Chicago. For the third day in a row, the temperature was about to soar past 98?F (37?C). People all over the city were getting sick from the heat. Michelle felt sick, too. The air conditioner in her ambulance had stopped working. Although overwhelmed by the heat, she had no time to worry about herself, however. She had lives to save.

Look inside to find out more about Michelle and others who bring life-saving help during heat waves. You'll also discover what causes the deadly hot weather, where the world's worst heat waves have occurred, and-most important-how to stay safe if one hits your area.