== Biological singularity ==
According to [[Werner Gitt|W.Gitt ]] the French chemist and microbiologist [[Louis Pasteur|L.Pasteur ]] in 1864 rejected the doctrine of spontaeous generation of living cells in his historical lecture at the Sorbonne university in Paris and formulated a [[scientific law]] about life expressed in latin words like ''Omne vivum ex vivo'' (All life comes [only] from life) that has never been disproved by [[experiment]].<ref name="Excuse">{{cite book
|title=Without Excuse
|author=Werner Gitt
|url=http://www.wernergitt.de/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=1505&virtuemart_category_id=126&Itemid=131&lang=de
|isbn=978-1-921643-41-5
|quote=}}</ref>
Philosopher of science Sir [[Karl Popper]] proposed that mankind may be "faced with the possibility that the [[origin of life]] (like the origin of physics) becomes an impenetrable barrier to science, and a residue to all attempts to [[Reductionism|reduce]] biology to [[chemistry]] and [[physics]]."
<ref name="Popper">{{cite book