With the twentieth anniversary of 9/11 this past Saturday, we share resources that readers flagged for us or that we otherwise missed about that day and its consequences

On December 3, John Nkengasong, director, Africa Centers for Disease Control and Prevention (Africa CDC), announced a 60 percent vaccination target—one estimate of the level needed to achieve herd immunity from COVID-19—in Africa’s fifty-four countries.

Dan asks a question that everyone who has ever signed up for military service has likely asked: was it worth it? His answer is worth reading. 

Developments in conflicts across the world that you might have missed this week.