Recently, I wrote about practical ways to ventilate for COVID-19, and why this is important. The idea from medical facilities and building scientists is that you want to optimize for “ACH” (or “air changes per hour”). This is a good start, because more air movement is better. …

Since the pandemic started, lots of people have been infected indoors. Good ventilation helps reduce the number of viruses you breathe in, and it can make spaces a little bit safer during the COVID-19 pandemic. First, you should read Zeynep Tufekci’s article on the issues associated with “short-range aerosol” transmission…

Can we use a new kind of UV-C light in occupied spaces? — In 1903, Niels Finsen was awarded the Nobel Prize for using UV-C light for disinfection, originally for lupus. Since then, UV-C has been used in tackling Tuberculosis and MRSA in hospitals. Recent interest in UV-C for COVID-19 has involved disinfecting air (since there is potential for the virus to transmit…

June 3, 2019 To the Committee on Energy, Utilities, and Communications, I write to oppose AB-7, and I hope to convince the committee that permanent DST will wake people up too early throughout the winter, restricting how much they sleep. …

We have to stop changing the clocks twice a year, but it’s also important to pick the right schedule when we do it. Thousands of scientists say that Standard Time is better, yet legislators are pushing for permanent DST, anyway. …

VR glasses are going to affect sleep like nothing we’ve ever seen I took my iPhone 6 and popped it into Google Cardboard. Put the spectrometer where my eyes usually go, and pushed the button. The meter took the reading really fast… 360 lux f.luxometer says that’s 90% as bright as daylight — meaning it can kick your circadian clock two timezones…

They’re good for more than the movies — Dolby just announced their Dolby Vision project. To make movies look better, they’re testing incredibly bright screens—20,000 nits—making so much heat they have to use liquid cooling. Normal screens clock in at just 200-400 nits, so it’s quite a jump. I’m sure the images look splendid, but that’s not why…