21.   The blast probably happened because the heat caused the air inside the table tennis balls to expand.

22.   The heat also causes brain cells to swell.

23.   The heat causes electrons to shoot out, some crossing the sandwich to generate an electrical current.

24.   The heat also caused machinery problems at the airport, slowing down baggage delivery.

25.   The heat causes the liquid to harden, and it melts the wax, adhesive and any organic material inside while leaving an impression of the hair strands.

26.   The heat caused the tire pressure to increase, making the tires more susceptible to damage.

27.   The heat will cause the photo support and emulsion to expand at different rates.

28.   The heat will cause the stucco to dry prematurely, shrink and develop hairline cracks.

29.   Too much heat may cause uncontrolled nuclear reactions underground.

30.   Engineers suspect the cartridges may have gotten mildew after being stored for so long, and that the heat from recycling caused them to stink.