But Robert Florence of Historic New Orleans Walking Tours Inc. believes that the facts surrounding the city's burial sites -- which include family tombs that hold generations of remains and sit above ground, preventing caskets from floating away during floods -- are as good as fiction.

CNN: Cemeteries breathe life into tourists

In places, the ground was so boggy the line had to be laid on a floating raft of logs, where it is still ironed flat by passing trains.

BBC: Full steam ahead

Most researchers still believe beta-amyloid is the culprit, but the idea that free-floating protein molecules, rather than the proteins in the plaques, are to blame is gaining ground.

ECONOMIST: Alzheimer's disease