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auch proofs are Ordinary felk could shrug them off with the absurd assurance that only = dozen men -could under- stand Einstein. Those days are over. On July i6,.1945, at Alamo- gordo, New Mexico, » small packet of matter was annihilated and a‘ tremendous eruption of energy was created from it. The old familiar universe died that day. Now every one everywhere must revise his concepts and put “common sense” in Its proper, very limited, place. And that ig the purpose of Mr. Barneti’s very able little book. There have been many books on Dr. Einstein himself, but -this is not one of them. There have been many “explanations” of his thought, or at least of the kind of evidence and thinking’ which jed to his conclusions. By stretched analogies and inadequate me- chanical models, if not by over dimpiitiet? ‘imathematios. many writers haye tried to popularize hla idens, Mr. Bartett avoids atl that. - His entire effort is on n rebuilding ‘the reader's conception of the uni- verse. He puts no strain on one's er arnerinnanéeal tanh SE knowledge of Cayo niques or of mathematics. It is not an easy task to teach a worm that the earth is round or a fish that the air ls navigable. Mr. Bar- nett's job is easier because human beings have inteNigence and imag- ination. Most men could never create what Einstein did nor even follow his detailed reasoning. But they can achieve the new vision ind accept the new concepts, pro- vided only that they have the fortitude to outgrow the “self- evident” concepts of thelr youth. The new conceplions already go far beyond the mere relativity of . ace and time and the equiva- ce of matter and energy. For. sistance, the universe is not in-