1) Cerebrospinal fluid AB42 predicting early onset Parkinson disease and 2) Topic of the month: Critical care neurology. This podcast for the Neurology Journal begins and closes with Dr. Robert Gross, Editor-in-Chief, briefly discussing highlighted articles from the print issue of Neurology. In the second segment Dr. Matthew Barrett interviews Dr. Henrik Zetterberg about his paper on cerebrospinal fluid A?42 predicting early onset Parkinson disease. Dr. James Addington is reading our e-Pearl of the week about Kennedy disease. In the next part of the podcast Dr. Mike Brogan interviews Dr. Laurie Gutmann about critical illness in polyneuropathy and myopathy. The participants had nothing to disclose except Drs. Zetterberg, Addington and Gutmann.Dr. Zetterberg serves as Senior Editor of the Journal of Alzheimer's disease; serves as Associate Editor of Alzheimer and Dementia; receives research support from the Swedish Research Council and Swedish State Support for Clinical Research. Dr. Addington serves on the editorial team for the Neurology® Resident and Fellow Section. Dr. Gutmann receives royalties from Up-to-Date Online from the publication of Hypokalemic and Hyperkalemic Periodic Paralysis; receives research support from Alexion Pharmaceuticals, Inc. and the NIH.