Because DNA is digital, it is a reliable way to store and copy information. Indeed, it can be copied again and again with tremendous accuracy, no different in principle from digital information stored in computer memory or on a DVD. DNA is also robust. When I first worked in a lab, I was shocked by how this “molecule of life” could survive for hours in boiling water and thrilled that it was recoverable from Neanderthal remains at least 40,000 years old.
Interesting validation of why genes aren't as instable as they seem. Although, fossilization is preserved in part due to protective sediment and from a lack of oxidation inflicted in the pre-cursive fossil's pocket of air.
