This week, researchers identified a key driver of pancreatic cancer spread. Oral bacteria were linked to Parkinson's disease via the gut-brain axis. And scientists are advising California legislators to prepare for destructive "supershear" earthquakes. Plus: Scientists have identified brain states that can lead to epiphanies; anthropologists reconstructed a million-year-old skull with Homo-sapiens-like features; and a new study reports that lifestyle changes can cultivate optimal well-being, even in elderly people: