The Gift of Fear Top 100 Self Help authors. The Gift of Fear was selected for the book, 50 Psychology Classics. By finding patterns in stories of violence and abuse, de Becker seeks to highlight the inherent predictability of violence. The book explores various settings where violence may be found—the workplace, the home, the school, dating—and describes what de Becker calls pre-incident indicators (PINS). By noticing PINS (events and behaviors that often precede violence), individuals can better predict violence before it occurs, and therefore, take the necessary precautions and actions to stay safe. "The Gift of Fear" also describes de Becker’s MOSAIC Threat Assessment
Irrational number During the 14th to 16th centuries, Madhava of Sangamagrama and the Kerala school of astronomy and mathematics discovered the infinite series for several irrational numbers such as "π" and certain irrational values of trigonometric functions. Jyeṣṭhadeva provided proofs for these infinite series in the "Yuktibhāṣā". In the Middle ages, the development of algebra by Muslim mathematicians allowed irrational numbers to be treated as "algebraic objects". Middle Eastern mathematicians also merged the concepts of "number" and "magnitude" into a more general idea of real numbers, criticized Euclid's idea of ratios, developed the theory of composite ratios, and extended the concept of