President Trump has been gas-lighting the masses regarding COVID-19.

When discharging industrial gas into the indoor environment in high altitude astronomy, we never wore protective breathing respirators that fed us oxygenated air at above the legally required 19.5% oxygen levels.

I never met anyone in astronomy that stated they had been sent on an industry recognized training course for the safe handling and use of cryogenic liquids & industrial gas.

My memories of high altitude astronomy indicate that up to four liquid nitrogen flasks were left venting gas into a small indoor workshop and office area where workers were permanently stationed.

My memories of my time in high altitude astronomy indicate that there were no oxygen concentration monitors or alarms in the areas that liquid nitrogen was in use inside of the high altitude astronomical facilities where I had worked.

If you have been breathing industrial gas, you may have pernicious anemia, multiple chemical sensitivity and organ damage.

I regard breathing industrial gas to be as harmful as heavy smoking.