|Lazzaro Spallanzani biology
Maggots grow in cow pies. Tapeworms grow in intestines. Without knowing that flies and worms lay eggs and that stepping barefoot into feces or eating undercooked food can pick them up, people believed that very small creatures were generated spontaneously from decaying plant and animal matter. People like John Needham asserted that a vital principle inhered in such substances that spontaneously generated living things. Lazzaro Spallanzani tried to prove this, sterilizing his samples in sealed flasks, and failed. Realizing that heating and sealing his samples killed anything alive that was already in them and protected them from contamination, Spallanzani demonstrated the principle of pasteurization and scooped Louis Pasteur by ninety-five years.
Invisible parasites bacteria, viruses too small to see infect my body. I itch; I cannot help it; I become feverish; I grow hungry; I eat certain leaves and barks and I am cured. An idea occurs to me and I cannot get it out of my head. I try to test the idea and find that it violates a principle of nature. Living things inhabit everything in the air, land, and sea in rocks, in soil, in every drop of water. Obsesssed, I wash my hands although they are already clean and the water makes my fingers itch.
Seems like miracles strangely inhabiting everything around us. Unidentified energies silently empower impossible creatures too numerous to count. Imagination generates reasons out of fears. Reason generates causes out of hopes. Surprise generates miracles when we can’t see the causes. We can’t explain these things. If this were pure luck, good or bad, it would be time to count our blessings.