Wiens has a Ph D in Physics, with a minor in Geology.His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.
Derivation: The word ‘pigeon’ is derived from the Latin word ‘pipio’, meaning ‘young cheeping bird’. Mention of pigeon sacrifices can also be found in both the Old Testament and the New Testament.
The word ‘dove’ is of Norse origin and first appeared in the 14th century as ‘dova’ or ‘douve’. The pigeon is probably best known for its ability to return ‘home’ from long distances and has been used extensively by man for this purpose.
To fill in the perceived omissions of classical Marxism, they sought to draw answers from other schools of thought, hence using the insights of antipositivist sociology, psychoanalysis, existential philosophy, and other disciplines.
Their emphasis on the "critical" component of theory was derived significantly from their attempt to overcome the limits of positivism, materialism, and determinism by returning to Kant's critical philosophy and its successors in German idealism, principally Hegel's philosophy, with its emphasis on dialectic and contradiction as inherent properties of human reality.
He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.