Operant learning is a process by which a specific behavioural response (such as a lever press) is associated with a biologically salient stimulus known as a reinforcer (such as food).

Welcome to the Madison County 4-H Program! We are glad you're here. 4-H has programs available for all Madison County youth in grades K-12. Please reach out to us with any questions.

Jacqui Heinrich hosts the "FOX News Sunday" panel with WSJ's Olivia Beavers, former Biden administration spokesperson Sabrina Singh, GOP activist Matt Gorman, and Mario Parker of Bloomberg.

Peter Morici is a columnist for MarketWatch. He is an economist and professor at the Smith School of Business of the University of Maryland. Follow him on Twitter @pmorici1.