01:02
Copyrights and Patents
This clip explains the importance of copyrights, trademarks and patents to protect original ideas, products, logos, phrases, names, symbols and the like.
03:48
Waves of Change: Technology and Social Change
Twentieth century sociologist Gerhard Lenski said that one way to understand social change is to look at the basic subsistence technology of a society. With that information, much can be deduced about stratification, gender relations, and politica...