Table of Contents


Views of the Universe
Man has been led to various views of the universe at various times in history. Here's how he sees it today.
by H. P. Robertson

The Purchase of a Gem Stone—or What to do Until the Appraiser Arrives
What makes a gem valuable? How can you tell the real thing from a piece of glass? An expert answers some basic questions about gems.
by Richard H. Jahns

Microsecond Chemistry
by Norman R. Davidson
A progress report on the Caltech research into chemical reactions which take place in less than a thousandth of a second.

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