"Molecular Clock" Can't Save Darwin from the Cambrian Explosion

Current Biology has published yet another attempt to explain away the Cambrian explosion. On reading certain parts, you might think the authors, including Maximilian Telford, Philip Donoghue, and Ziheng Yang, have solved the problem. Indeed, their first Highlight in the paper summary claims, "Molecular clock analysis indicates an ancient origin of animals in the Cryogenian." (Cryogenian refers to the Precambrian "cold birth" era about 720 to 635 million years ago.) By itself that statement w...