Self Determination Theory: Also called SDT (not to be confused with STP, which works with cars), SDT is a special brain additive bestowed by evolution that separates humans from all other life forms, and gives extra intrinsic energy or motivation (also called free will) so that we can be obnoxious, lazy, make stupid choices, and be totally oblivious to the consequences. Also called 'I'm determined to do it myself theory', and when applied to social groups, 'American foreign policy'.