This paper interrogates the concept of knowledge in postmodern times. It is evident that in the 21st century new types of citizens are required: ones who are able to work collaboratively in knowledge-building communities in order to generate the new forms of knowledge that will propel us forward in the century. However, school curricula would seem to remain firmly rooted in the industrial age of previous times. Examples are provided of curricula that embrace the creation of new knowledge in schools that are relevant to the lives of people as well as more detailed descriptions of curriculum applications that enable learners to participate in knowledge-building communities that are vibrant and exciting.