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The Purple Earth Hypothesis (PEH) is an astrobiological hypothesis, first proposed by molecular biologist Shiladitya DasSarma in 2007, that the earliest photosynthetic life forms of Early Earth were based on the simpler molecule retinal rather than the more complex porphyrin-based chlorophyll, making the surface biosphere appear purplish rather than its current greenish color. #MostDiscussed #Bio mostdiscussed.com/article/4086

www.mostdiscussed.comMost Discussed 📖 - Purple Earth Hypothesis

Ignaz Philipp Semmelweis (German: [ˈɪɡnaːts ˈzɛml̩vaɪs]; Hungarian: Semmelweis Ignác Fülöp [ˈsɛmmɛlvɛjs ˈiɡnaːts ˈfyløp]; 1 July 1818 – 13 August 1865) was a Hungarian physician and scientist of German descent who was an early pioneer of antiseptic procedures and was described as the "saviour of mothers". #MostDiscussed #Biography #Medicine #HistoryOfScience #Hungary #ProjectindependentA mostdiscussed.com/article/4075

www.mostdiscussed.comMost Discussed 📖 - Ignaz Semmelweis