41.   Variable clouds will cover the northern Plains with bands of potent thunderstorms erupting in the afternoon as currents of heated air rise into a pocket of cold air aloft.

42.   When the bread goes into the oven, the gases give one last jump after they hit the heated air inside.

43.   You can do this by wrapping them or opening kitchen and bathroom cabinets to allow the heated air to warm the pipes.

44.   Heated air is blown over the tobacco leaf in specially constructed barns where levels of carbon dioxide, oxygen and other factors are tightly controlled.

45.   The heat source continues to burn as the cigarette is smoked, transferring heat and heated air through the cigarette as the smoker puffs.