One Sunday last fall I was introducing my two young sons to...

One Sunday last fall I was introducing my two young sons to touch football in our backyard. During a rather reckless maneuver to avoid being tagged, I collided with a tree. The impact against my side was so great that I was left on the ground struggling for breath.

According to physics, the apparent solidness of matter derives from its character as structures and substructures of isolated particles held in a force or gravitational field. For several weeks I had been musing on this subject as defining matter's basic claim to be substance.

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Words of Current Interest
January 26, 1974
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