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#JohnTyndall physicist and philosopher, defender of #Darwinism (most notably in his #BelfastAddress), died #OTD 4 Dec 1893.

He was the first scientist to explain "why is the sky blue." He also conducted the first study of London pollution and opened up public debate into the greenhouse effect on earth's atmosphere. #ClimateChange

On Tyndall's Belfast Address : https://branchcollective.org/?ps_articles=bernard-lightman-on-tyndalls-belfast-address-1874

Bio: https://www.dib.ie/biography/tyndall-john-a8696

Image from https://commons.m.wikimedia.org/wiki/File:John_Tyndall_(ca._1885).jpg