Within higher education, there [are different] epistemological positions. [Objectivists] will argue that there exists a reliable set of facts, principles, concepts, and theories that can be consistently demonstrated and proved. Truth exists independently of the human mind. Thus the laws of physics are constant, whether you believe in them or not.

Constructivists, however, argue that knowledge is essentially subjective, constructed from our perceptions and mutually agreed on conventions. Thus even science is merely what scientists believe to be true at the time, and can be interpreted differently (the argument over climate change is a case in point). Knowledge is dynamic and not constant, we continue to assimilate new information that leads to the reconstruction of our understanding.

from Managing Technology in Higher Education: Strategies for Transforming Teaching and Learning by A. W. (Tony) Bates, Albert Sangra