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CHAPTER PAGE I Unpuzzling the Universe I
Within the Suns Family
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airplane alpha particles aluminum American animals artificial astronomical atmosphere atom autogyro automobile balloon beryllium body bombardment bones brain cause cent chemical clouds color cosmic rays deuterium deutons discovered discovery disease early earth effect electrical elements energy engine erosion expedition experimental experiments eyes feet forest frequency galaxies gamma rays gland Graaff heat heavy hydrogen heavy water height helium hormone human hydrogen iconoscope important inch insects Institute isotope known laboratory lands layer light mass matter ment metal meteor method miles per hour million volts modern mosquito natural neutrons nucleus observations oxygen P. A. M. Dirac patients photographic physicists pilot pituitary plant positron produced Prof proton radiation radio waves radioactivity radium region result scientific scientists showed speed stars sterilization stratosphere sunspot telescope temperature theory tion transmutation tube ultraviolet United University Van de Graaff visible voltage volts weather wind X-rays