Fill in the blank in the quiz: A plague research employee in Russia died from ____

Plus: Nobels! Protests! Ambiguous quotes! A mysterious death in Russia!

<img src='https://npr.brightspotcdn.com/dims3/default/strip/false/crop/5654x3182+0+0/resize/5654x3182!/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2F6b%2F74%2F37b9e76b4ab0bed602f029c28b25%2Frm-cher-david.jpg' alt='From left: A BTS member, Cher, David Ellison.'/><p>Plus: Nobels! Protests! Ambiguous quotes! A mysterious death in Russia!</p><img src='https://media.npr.org/include/images/tracking/npr-rss-pixel.png?story=g-s1-147111' />