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Air purifier metrics, theoretical considerations

Each 10 μg/m3 of PM2.5 air pollution is associated with an 8% increase in risk of mortality.1 For context, the average PM2.5 in inner London was 8.5 μg/m3 in 2024.2 This is…
Apr 16, 2024

How fast is that fan rotating?

I have a Blueair Blue 3410 Air Purifier, but the technical specifications are quite sparse - for example they don’t specify how fast the fan spins at each of the three speed…
Jan 1, 2022

Spending Habits

Since 2011 I have been keeping meticulous records of everything I spend money on. I really mean everything, including, for example, the 6 pence I spent on a 75g carrot which…
May 2, 2018

 

Random countries Twitter bot

Being able to recognise flags and locate countries on a map is the kind of general knowledge I that feel I ought to have. This project was a kind of productive…
Sep 16, 2017

Learning Languages with Zipf’s Law

Learning a new language can be a daunting task. However, the word frequencies in many languages follow Zipf’s law in that the most frequent word occurs twice as often as the…
Apr 5, 2017

Oxford Colleges Comparison

Oxford University is made up of 38 self governing colleges (and 6 Permanent Private Halls). A college is where students live, eat, and attend tutorials (small group…
Feb 19, 2017

Reanalysis of the evidence for a limit to human lifespan

Recently a paper was published in the journal Nature titled “Evidence for a limit to human lifespan” which received wide publicity, by nature itself, the New York Times, the …
Nov 1, 2016

Tracking the temperature of my room

Tracking my room temperature with a data logger, inspired by this reddit post.
Sep 25, 2016

Fitting linked mixture models

A mixture of gaussian distibutions can be used to approximate a different non gaussian distribution. For example the hights of a population may be non-normal, but are well…
Sep 23, 2016
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