Life in the Universe: "It May Not Even Have a Genetic Code"

Life in the Universe: "It May Not Even Have a Genetic Code": "The search for life should not and cannot be limited to the search for Earth-like features. This cosmic view of the diverse nature of extraterrestrial life, is a revolutionary perspective which has the potential to make a great impact on our way of thinking as profound as the Copernican revolution.

We should be careful if we ever happen upon extraterrestrial life, Hawking warns. Alien life may not have DNA like ours: 'Watch out if you would meet an alien. You could be infected with a disease with which you have no resistance.'"