Scientific American, Volum 218

amino acid animals atoms baryon beam behavior blood bottom camera cells chain chemical circuit color Company copper Corporation crystal device digital root digits effect electrical electron energy engineering enzyme experiments factor film filter fluid frequency heat pipe hologram holography human illustration inch industry laboratory Leibniz lens light Lunar Orbiter magnetic field material mathematics mechanism menarche ment mesons metal methionine million missile molecules motion nuclear nucleus obsidian operation oxygen particles pattern peptide percent photographs physics plants polar pollen pressure problems produce protein protons Publisher's Price pulse qanat quark radar record result rotation SCIENTIFIC AMERICAN scientists signal space spacecraft square steel structure surface synthesis Tartaria tablets technique temperature tetanus tion tRNA tube ture unit University Vinca culture wave write