Ideas from 'works' by Albert Einstein [1915], by Theme Structure

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14. Science / B. Scientific Theories / 3. Instrumentalism
Special relativity, unlike general relativity, was operationalist in spirit
27. Natural Reality / A. Physics / 1. Matter / h. Mass
Mass is a measure of energy content
28. God / E. Attitudes to God / 4. Atheism
I do not believe in a personal God