More from our inbox: Questions for AmericaCredit…Kelli AndersonTo the Editor: Re “The Lesson From a Nobel Laureate’s Chosen Death,” by Katarzyna de Lazari-Radek and Peter Singer (Opinion guest essay, April 20): I admire and respect Daniel Kahneman …

Tia Zakher’s videos about not washing her face drew millions of views, numerous questions and some legitimate concern. She insists she’s fine.