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Readers respond to an essay by Dr. Sandeep Jauhar about his father’s Alzheimer’s. Also: The nuclear arms race; old social media; personalized search.

United statesNew yorkColumbia universitySandeep jauharEthan annisSara murphyBrianx chenKathy woukVladimir putinRichardm perloffBeth kallmyerJudith koll healeyIrwin redlenerElon muskEd alcockDisaster preparedness at columbia university