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Hereward Carrington answers questions about familiar bodily reactions and natural phenomena, from tears, frowning and laughter to colour, sunlight and earthquakes. Brief sections use everyday observations as starting points for explanations of physiology and the physical world.
Other topics include comets, the heat of the sun, relativity, gravitation and the possibility of life beyond Earth. The complete 1924 Little Blue Book No. 493 retains Carrington’s original examples and arguments, E. Haldeman-Julius’s editorial credit and the source publication notices.