“As the pandemic engulfed the world during the past several months, I kept returning to the question of what might explain these discrepancies. It was an epidemiological whodunnit. Was the “demographic structure” of a population the real factor? Were the disparities exaggerated by undercounting, with shoddy reporting systems hiding the real toll from public-health analysts? Was government response a critical variable? Or were other, less obvious factors at play?” The New Yorker’s Siddhartha Mukherjee with an interesting look into one of Covid-19’s most perplexing mysteries. Why Does the Pandemic Seem to Be Hitting Some Countries Harder Than Others?