The French Black Copper Maran lays the darkest egg of all chicken breeds. Until a few years ago this breed was difficult to find and a breeding pair would go for hundreds of dollars. The dark eggs are prized by French chefs because of the deep orange yolks and rich flavor.
The events that students experience as reinforcing and punishing are always changing based on both the presence and absence of many different environmental and social situations. The term Setting Event is used to describe the events that momentarily change the value of reinforcers and punishers in a student's life.
The common assumption of agenda-setting is that the ability of the media to influence the visibility of events in the public mind has been apart of our culture for almost half a century. Therefore the concept of agenda setting in our society is for the press to selectively choose what we see or hear in the media.