Howard Zail

Is there an upper limit to lifespan? Lessons from Telomeres, Tortoises and Mollusks.

Ming, the mollusk, was estimated by by a team of researchers to be 507 years ago, making it the oldest living animal recorded. Ming is a quahog or clam.  You can tell the age of the clam by counting the rings in its shell. Aging a quahog is essentially the same as aging a tree. …

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quick_post3.utf8.md R Markdown This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see http://rmarkdown.rstudio.com. When you click the Knit button a document will be generated that includes both content as well as the output of any embedded …

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Covid-19 Progression Analysis

Covid-19 Progression Analysis Introduction This updates a prior post analyzing the growth rate of Covid-19 infections and deaths by country. The analysis is conducted as of 2020-03-24 The daily growth rate of cumulative confirmed cases and deaths are calculated as: \(G_{confirmed}=growth~rate~confirmed=log(Confirmed_t / Confirmed_{t-1})\) \(G_{deaths}=growth~rate~deaths=log(Deaths_t / Deaths_{t-1})\) Using this formulation, the total growth after \(d\) days …

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