Very good. An in-depth look at vaccine research related to the present-day pandemic. Well-sourced and replete with exemplary quotes and context-providing commentary. The full study referenced is available for the more intellectually and informationally inquisitive reader to peruse at their leisure. I had a scan earlier in the day and found it well worth a complimentary read. Well-written in a layman-accessible style. The Author does a good job of putting paid to excessively technical jargon and keeping things simple. Four stars!