We used to think that if we knew one, we knew two, because one and one are two. We are finding that we must learn a great deal more about 'and'.
A star is drawing on some vast reservoir of energy by means unknown to us. This reservoir can scarcely be other than the subatomic energy which, it is known exists abundantly in all matter; we sometimes dream that man will one day learn how to release it and use it for his service. The store is well nigh inexhaustible, if only it could be tapped. There is sufficient in the Sun to maintain its output of heat for 15 billion years.
For the truth of the conclusions of physical science, observation is the supreme Court of Appeal.
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