A continuation of the original thread. NB: This thread is not for discussion of theories; it is only here to list them. The list below has now been updated by Mladen for this iteration of the thread. Welcome to the second edition of Compendium of Theories thread. The thread was opened in January 2013, and since then, it became must-read for all those who want to learn about popular and widely-accepted theories on this board. Since last January, the thread was updated several times, and