Stephan and his boss agree to extend his employment contract by an additional six months. The employment contract states that all amendments must be in writing, so Stephan and his boss cross out and change the provision in his contract that covers the duration of his employment and rewrite it to include the additional six months. They each initial and date the change, and they each keep a copy of the agreement. Is the amendment valid?

In the 1970s, kmart used blue light specials to encourage customers to flock to a particular department having a temporary sale. a spinning blue light activated for approximately 30 seconds, and then an in-store announcement informed shoppers of the special savings in the specific department. over time, loyal kmart shoppers learned to flock to the department with the spinning blue light before any announcement of special savings occurred. if kmart was employing classical conditioning techniques, what role did the spinning blue light play?