Mr. Half-Knowledge

Fact: At 06:00 hrs the shadow of the building is at one side and at 15:00 hrs it is moved to the other side.

Mr. Zero-Knowledge:

He doesn’t even observe the shift of shadow and knows nothing about that

Mr. ½-Knowledge:

He observes movement of the shadow and thinks that it is due to movement in the building

Mr. ¾-Knowledge:

He observes movement of the shadow and thinks that it is due to movement of the Sun

Mr. Full-Knowledge:

He observes movement of the shadow and knows that it is due to movement of the Earth

Bottom line: “Half-Knowledge is more dangerous”