Two-Sigma

Every year, it seems that the internet gets just a little more filled with ads. For many years I’ve had several ad-blocking extensions installed in my browser, but they’re constantly engaged in an arms race against site maintainers. As a notable example, YouTube recently began cracking down on ad-blocking extensions,... [Read More]

By World War II, radar had become an essential tool used by every modern military to detect incoming enemy aircraft. Operators had long noticed that radar systems returned strange echoes during inclement weather, and it was soon discovered that these anomalous signals were actually signatures of precipitation itself. After all,... [Read More]

Fitbit announced in August of 2020 that it would be activating the Estimated Oxygen Variation (EOV) graph feature for tracking blood oxygen saturation changes during sleep. For several years, Fitbit and other smartwatches had been equipped with red and near-infrared (NIR) LEDs and photodetectors to measure blood oxygenation at the... [Read More]

In his 1925 book “Statistical Methods for Research Workers” Ronald Fisher wrote: [Read More]