Phylogenetic trees help identify the most fundamental features of the last universal common ancestor of all cellular life on Earth. How many domains of life are there? Maybe a viral phylogeny can be grafted as a root onto the tree of cellular life? Did viruses, viroids or ribozymes play a role in the origin of life? Was the RNA world a viral world? The controversial claim is made that there is no minimal amount of information or minimal size to “life”.