Knowledge

How do we know things?  Experimentation, deduction, observation?

In Genesis, knowledge is first associated with two things – with food and with sex.  There is a tree of the knowledge of good and evil, whose fruit opens the eyes of Adam and Eve so that they perceive that they are naked.  Then Adam knows his wife and she conceives Cain.

If we want a strictly biblical answer: Knowledge is eating.  Knowledge is sex.