In order to say that some function is understood, every relevant step in the process must be elucidated.

Skin is made in large measure of a protein called collagen.

As can be seen even by this limited number of examples proteins carry out amazingly diverse functions.

In private many scientists admit that science has no explanation for the beginning of life... Darwin never imagined the exquisitely profound complexity that exists even at the most basic levels of life.

It was only about sixty years ago that the expansion of the universe was first observed.

Many people, including many important and well-respected scientists, just don't want there to be anything beyond nature. They don't want a supernatural being to affect nature.

In order to say that some function is understood, every relevant step in the process must be elucidated.