Is your memory like something that can recorded and retrieved on magnetic tape? No. We can discard that as an extremely poor analogy. Our guest on Fuzzy Logic today is an expert on how memories are laid down and recalled. It's a subtle, complex thing with many facets that we don't entirely understand. For one thing, there are different types of memory, and it's far from an immutable record. It has links to autism and PTSD, among other things. We discuss the recent pronouncements from the USA about Tylenol 'causing' autism. Official Fuzzy Logic policy states that we support critical thinking, which means we strongly reject assertions made without evidence, especially where they relate to public health. Dr Shaam Al Abed is a Postdoctoral Fellow from the Eccles Institute of Neuroscience, at the ANU. Interview by Tara and Rod