They studied alligators to arrive at their conclusion. It's pretty insane how long that group of animals have been on earth: the same basic design has been in play for 200 million years.
Compare that to your typical piece of software ;)
Compare that to your typical piece of software ;)
In our defense we do not have hundreds of millions of years of test driven development. :P
Which begs the question: If that’s true, why didn’t nature use TDD? If it doesn’t, maybe it is not the right design?