Hey, first of all - thanks for doing this AMA. How do you feel about GABA-B agonists such as Phenibut and their [ability to reduce stuttering in some individuals](https://pubmed.ncbi.nlm.nih.gov/11830761/)? I have a fluctuating mild-severe stutter and the days I have used a moderate-high dose of phenibut it has helped me greatly. Obviously, there is risk of dependence when it comes to this drug in particular.... but the lack of research still astonishes me. Is there room for these type of drugs or do the cons out-weigh the pros? An interesting question I've had for a while is in regards to my younger sister. There is no history of stuttering within my family (that I know of), however I have a feeling that my stuttering somehow "spread" for a lack of a better term to my sister as she was growing up. However, i have two younger (older than the sister in question) sisters who speak completely fluently regardless. How much of stuttering do you think could be influenced by environmental factors or "nurture"?