masks

A short TheStreet clip in which Dr. Anthony Fauci explains the purpose of masks and why guidance on them shifted during early COVID-19. He says masks protect others and offer some protection to the wearer.

Ben Krasnow of Applied Science uses an antique 4x5 view camera to make high-resolution photolithography masks in a home shop. He photographs a poster-sized printout onto litho film to get features around 20 microns.

Asian Boss interviews Professor Kim Woo-joo of Korea University Guro Hospital about COVID-19 in early 2020. He covers masks, testing, aerosol spread, and South Korea's response.

Joe Rogan interviews epidemiologist Michael Osterholm in March 2020 about the coronavirus. They cover how it spreads, masks, hygiene, social distancing, school closures and vaccine timelines.

Technology Connections explains the early history of analog color television, from the 1954 start of modern color broadcasting, and how shadow masks work in CRTs. It is the first in a series on how analog color TV works.

A short 60 Minutes clip from March 2020 in which Dr. Anthony Fauci tells Jon LaPook there is no reason to walk around wearing a mask. The full interview includes his concern about mask shortages for healthcare workers.

Huygens Optics experiments with etching tiny patterns in glass, covering hydrofluoric acid risks, buffered oxide etch, photoresist and chromium masks, and laser-induced etching. It ends with attempts at microscopic Tesla valves.

Former CIA Chief of Disguise Jonna Mendez reviews spy scenes from film and TV and explains how realistic they are, including disguise techniques and masks.