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A thought often makes us hotter than a fire.

What is it about the component of fire? People have written about it. People have wondered about it.

The heart in man signifieth the heat or the element of fire, and it is also the heat; for the heat in the whole body hath its original in the heart.

When you work at a microscopic level, you have to control every part of your body movement - your fingertips, your joints, the pulse in your fingers.

When air is hot, the molecules move fast and they have high kinetic energy. The colder the molecules are, the smaller their velocities are and, subsequently, their energy. Temperature is simply a way to characterize the energy of a system.

Science casts a long black shadow back over who we think we are, and where it falls the temperature falls with it. Its touch is chilly and unforgiving.

Many hands make light work.

Heat can also be produced by the impact of imperfectly elastic bodies as well as by friction. This is the case, for instance, when we produce fire by striking flint against steel, or when an iron bar is worked for some time by powerful blows of the hammer.

The hand is, in the highest degree, a human characteristic. It is man's organ of grasp and of the sense of touch, while in animals these two functions are relegated to the mouth.