Coronavirus, emotions and guns.

Episode Summary

Executive Summary: This episode of More or Less checks three viral or public claims with statistics: exaggerated coronavirus panic, a dubious claim that 75% of emotions are driven by smell, and a gun-violence argument linking gun ownership to homicide and mass shootings. Experts say the coronavirus tweets overstated the R0 and “pandemic” status; the smell statistic lacks published support; and gun ownership is not linked to lower homicide rates, though mass-shooting comparisons depend heavily on definitions.

Main Topics: Coronavirus panic vs. measured epidemiology: The show evaluates viral tweets calling COVID-19 a “thermonuclear pandemic” and using an R0 of 3.8, then consults an infectious disease expert to assess the real transmission and fatality numbers. What R0 and case fatality rate actually mean: The segment explains reproduction numbers, how interventions reduce spread, and why case fatality rates are hard to estimate early in an outbreak because mild cases are often missed. Smell and the “75% of emotions” claim: A listener-flagged claim from a branding book is traced, but the supposed evidence is unclear and unpublished; a psychology expert explains that smell is emotionally powerful but cannot account for 75% of emotions. Gun ownership, homicides, and mass shootings: The show scrutinizes a Wall Street Journal piece and John Lott’s argument that high gun ownership countries have low homicide and mass-shooting rates, finding the homicide claim false and the mass-shooting claim highly dependent on definitions. The importance of definitions in statistics: Across the episode, the analysis shows how outcomes change when terms like pandemic, mass shooting, and case fatality rate are defined differently. Public fear, communication, and behavior during crises: An expert warns that overblown messaging can fuel panic, reduce trust, and make people avoid health authorities, worsening outbreak control.

Key Arguments: Calling the coronavirus outbreak a “thermonuclear pandemic” was an exaggeration; at the time it had not become a pandemic because sustained spread to other continents was not yet significant. The tweeted R0 estimate of 3.8 was based on a paper that later revised its calculations downward; Imperial College London’s estimate was closer to 2.5. R0 is not fixed: prompt case identification, isolation, and other public-health measures can reduce transmission below 1 and eventually control an epidemic. Coronavirus’ R0 of about 2.5 is not extraordinary compared with other epidemic diseases; Ebola in Liberia was around 2, while measles can be 16 to 18 in a susceptible population. The case fatality rate for coronavirus was estimated at roughly 2% to 3% at the time, high compared with seasonal flu but closer to pandemic flu than to Ebola or SARS. The “75% of emotions are driven by smell” claim could not be traced to strong peer-reviewed evidence; smell is important to emotion, but emotions are multi-sensory and not reducible to one sense. The claim that countries with more guns have lower homicide rates is false in developed countries; the U.S. homicide rate is much higher than many peer countries despite high gun ownership. Mass-shooting comparisons are highly sensitive to definitions: the FBI definition produces far fewer incidents than the Gun Violence Archive definition. Most gun homicides are not public mass shootings, so mass-shooting statistics can obscure the larger firearm homicide problem. Exaggerated or misleading statistics can distort public understanding, increase fear, and reduce compliance with public-health advice.

Data Points: Coronavirus cases in China: 9,500 - Reported during the segment on the outbreak's spread Coronavirus deaths in China: at least 210 - China’s reported death toll at the time of the episode Coronavirus deaths worldwide at one point: 41 - Early update referenced from news reporting R0 estimate in viral tweet: 3.8 - The number Dr Eric Ding highlighted in his social-media thread Revised R0 estimate: about 2.5 - Estimate cited from Imperial College London by Dr Natalie McDermott Seasonal flu R0: about 1 - Used in explainer of reproductive number Smallpox R0: over 3 - Used as a comparison in the explainer Polio R0: 4 to 6 - Used as a historical comparison before vaccines Measles R0: 16 to 18 - Estimated in a susceptible population Coronavirus case fatality rate: about 2% to 3% - Estimate discussed as of the broadcast date Ebola case fatality rate: 50% to 60% - Comparison used to show higher lethality SARS case fatality rate: about 10% - Comparison used to contextualize coronavirus severity Mass shootings in the U.S. in 2018 (FBI definition): 27 - Count using a stricter public-place, 3+ deaths definition Mass shootings in the U.S. in 2018 (Gun Violence Archive definition): 340 - Count using a broader definition that includes domestic and drug-related shootings U.S. gun ownership rate: 120 per 100 people - Approximate level cited in comparison with peer countries Norway gun ownership rate: about 30 per 100 people - Used in comparative discussion UK gun ownership rate: about 5 per 100 people - Used in comparative discussion U.S. homicide rate: 5.4 per 100,000 - Compared with other developed countries Norway homicide rate: 0.4 per 100,000 - Used as a contrast to U.S. homicide levels UK homicide rate: 0.2 per 100,000 - Used as a contrast to U.S. homicide levels U.S. firearm homicides in 2016: 14,542 - Shown to dwarf public mass-shooting deaths U.S. mass-shooting deaths in 2016 (FBI definition): 71 - Used to show mass shootings are a tiny share of gun homicides Norwegian population: around 5 million - Used to explain why a single massacre skews national rates Population of the U.S.: more than 320 million - Used to highlight why rate comparisons differ across countries

Pivotal Quotes: "The new coronavirus is a 3.8! How bad is that reproductive R0 value? It is thermonuclear pandemic level bad." — Dr Eric Ding (quoted tweet): Viral social-media post the segment investigates "I think that that's a little bit of an exaggeration and a little bit overexcitable in terms of the phrases he's used." — Dr Natalie McDermott: Assessment of the viral coronavirus claims "The sense of smell can evoke a lot of emotions, but it certainly cannot evoke all of them." — Jonas Olofsson: Expert rebuttal of the 75% smell claim

Implications: Listeners should treat dramatic statistics with caution, check definitions and sources, and distinguish hype from evidence. In health crises and policy debates, precise numbers and careful wording matter because fear and misleading comparisons can distort decisions.