Social news site Reddit’s IAMA feature is known for attracting a diverse roster of experts willing to be grilled by the masses.

Recent Q&As have included “I was sentenced to 50 years in prison at the age of 18 for non-violent crimes”; “I am a Canadian immigration lawyer”; and Vice‘s Tim Pool reporting on the Ukraine uprising. President Barack Obama has done one, as president, as have Bill Nye the Science Guy and Bill Gates.

Also on this list: Christopher Austin, who directs the National Center for Advancing Translational Sciences, part of the National Institutes of Health, who was accompanied by Wall Street Journal reporter Amy Dockser Marcus.

The Dec. 4 conversation ranges from the role advocacy can have in rare disease research, how and if automation is important, medicine costs and research models for Niemann-Pick Type C, among others.

It’s not in-the-weeds, or the OED, so it’s readable in a relatively short amount of time.