US Patent No. 9,956,155 B2; The Procter & Gamble Company, Cincinnati, OH, has been awarded a patent for a method to straighten naturally curly hair fibers. It is comprised of a crosslinking composition that is comprised of an active agent (wherein the active agent is an amine or diamine and wherein the amine or diamine is selected from the group consisting of 1,7-diaminoheptane, 1,4-diaminobutane, 6-aminohexan-1-ol, 6-amino hexanoic acid, 2-aminoacetic acid, 2-amino-2-oxo-ethanoic acid, 4-a...