When Theory and Experiment Collide

I've argued that Darwin's mechanism probably isn't powerful enough to produce proteins with fundamentally new structures. [1] If that's correct it's a serious problem for the old theory, because we know that new protein structures--new folds, as they are known--appeared well over a thousand times in the history of life. If Darwinism doesn't account for these then whatever else it may be, it isn't a complete theory of biological origins.

New protein functions don't always call for completely...