Stacker has chronicled social, scientific, and business inventions that changed America over hundreds of years.

Fear conditioning is a type of classical conditioning that involves pairing an aversive stimulus (such as an electric shock) with either a neutral context (such as a location) or stimulus (such as a ...

Henry Mintzberg is a Canadian management theorist who focused on what managers actually do at work. He described 10 everyday roles that managers play, grouped into three types: working with people ...

Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ideas such as energy, mass, particles and waves. Physics attempts ...

Abstract: Most operant conditioning circuits predominantly focus on simple feedback process, few studies consider the intricacies of feedback outcomes and the uncertainty of feedback time. This paper ...

Gold has pulled back to its 200-day moving average for the first time in over two years. While precious metals are attempting to find a floor, broader market stress continues to weigh on the sector.