Learning
While Rising Carbon Dioxide Levels in the Atmosphere Cause Great Concern Worldwide, Most of Us Pay Little Attention to Risks Posed by CO2 Changes Indoors
How do the new sensors work? They’re easy to operate -- in fact there is nothing to operate. They indicate changing CO2 levels by changing color, like pH strips we are familiar with. If the color indicates a high level of CO2 the person would know that they need to open a window, go outside or adjust the building HVAC. The sensor operates without any electrical power. High surface area also means we need very little material, so the sensor can be very small and lightweight. more »
Jo Freeman: A Tale of Three Protests – in Brooklyn
Jo Freeman writes of the scene: "There were more white protestors than there were white cops. The white shirt NYPDs were mostly white and the blue shirts were mostly non-white (but diverse non-white). The former are the older generation, who have risen to positions of authority." "There were a lot of women on both sides. In the eighties, a time when I dealt with a lot of NYPD officers who were not thrilled about women joining the force, the men told me that women weren’t big enough or strong enough to be effective police officers. At that time cops had to be a minimum height of 5"6' – which eliminated most women without really trying. Last Saturday, I was impressed with the sheer number of short women of all colors, facing down the protestors along with the men. I only saw one woman white-shirt." more »
National Museum of African American History and Culture Launches Web Portal, “Talking About Race”
Research shows that many people feel they do not have the information needed to discuss race in a way that is candid, safe and respectful of other viewpoints and experiences. National Museum of African American History and Culture launches a Web Portal, “Talking About Race”. Explore Talking About Race at nmaahc.si.edu/learn/talking-about-race. The portal is free and does not require a registration or sign-up to use. more »
Update From Johns Hopkins Medicine: Coronavirus Face Masks & Protection FAQs Including Frequent Hands Washing!
Can I create my own filter? Some people buy or create masks with a pocket inside to hold a filter, such as a coffee filter. When using other materials to make your own filter, such as unused vacuum cleaner bags, HEPA furnace filters, HVAC anti-allergy filters or other air filters, make sure you sandwich the filter between at least two layers of fabric to cut down on the risk of inhaling potentially harmful fibers from these materials. There are not yet conclusive data on whether or not filters provide added protection, but studies are underway. Please make sure that you can breathe easily when wearing the mask, and do not use a filter if it makes you feel short of breath. more »