Donnerstag, 4. Dezember 2014

How Toxic is Our National Atmosphere?

http://goodmenproject.com/featured-content/toxici-national-atmosphere-wcz/ Early coal mines did not have ventilation systems, so miners would bring a caged canary along. Canaries are especially sensitive to methane and carbon monoxide gas, which made them ideal for detectin…

Keine Kommentare:

Kommentar veröffentlichen