Complexity (such as we see in a pile of autumn leaves) can arise spontaneously from unguided natural processes, but complex specified information cannot.
This is one key issue on which proponents of ID and of theistic evolution differ.
Dr. Meyer offers here a very crisp and helpful introduction to the codebreaking work of Francis Crick, and more.
“It’s quite plausible” is treated as equivalent to evidence, eliding the question of how exactly we come to “consciously believe” anything.
Patients missing large parts of their brain tissue can lead normal lives because the material, the tissue, is not all there is to us.