How do humans and other animals face novel problems for which predefined solutions are not available. Human problem solving links to flexible reasoning and inference rather than to slow trial-and-error learning. It has received considerable attention since the early days of cognitive science. giving rise to well known cognitive architectures such as SOAR and ACT-R. https://www.nacrack.com/mega-choice-2005-2006-NISSAN-ALTIMA-Radio-Receiver-AM-FM-stereo-single-CD-Player-G-mega-value/