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New light on the trajectory of human intelligence after birth came from the University of California's Dr. Harold E. Jones, who stated that people are smartest at the age of 21, after which they grow duller.
In Paris, Psychologist Henri Pieron measured the amount of light which made him see, the amount of noise which made him hear, the amounts of energy which stirred his senses of taste, smell, touch. He examined the brains of beasts and men and concluded, he said in Chicago last week, that for every kind of outside impulse to which man is sensitive there is a particular, infinitesimal cell in his brain. We do not see ultraviolet light or feel infrared heat simply because we have no brain cells to receive those impressions. The impressions which do stimulate our brain affect it by pulsating radiations along distinct nerve cells. Thus "all our sensations rest upon the circulation of electric discharges in cells which stimulate each other" and all we know about existence is only as real as dreams.
Our sense of time also depends upon our sensory experience, added Professor Pieron while he was on the subject. Each individual has an organic rhythm which can be altered. Seconds become shorter for us when we have a fever, and conversely the days grow longer. An experiment on trained bees confirmed this heat-altered idea of time. The bees were trained to get their food at a particular time and place. The hotter the bees became the earlier they appeared for meals.
*Chemist Francis William Aston of Cambridge, England. Physicist Niels Bohr and Neurologist August Krogh of Copenhagen, Neurologist Archibald Vivian Hill of London. Chemist Theodor Svedberg of Upsala.
† Physicist Robert Andrews Millikan of Pasadena, Physicist Arthur Holly Compton of Chicago.