Kant became Professor of Logic and Metaphysics at the University of Königsberg in 1770 and taught there for most of his life. He was also greatly interested in science and published works on astronomy and geophysics.

His three most significant works were published later in life. The Critique of Pure Reason came out in 1781, followed in 1788 by the Critique of Practical Reason and in 1790 by the Critique of Judgment. The Critique of Pure Reason is one of the most important works in the whole of philosophy. Unfortunately it is also one of the most unreadable - Kant himself described it as dry and obscure.

Kant had generally been an outgoing and friendly man but towards the end of his life his mental faculties and his sight deteriorated badly. He died a shadow of his former self, aged 80. One of his most quoted sayings is carved on his gravestone in Königsberg: "Two thi

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