Leonardo da Vinci becomes more of a scientist with age and performs experiments to test theories. Muslim scientists in the Middle East had been testing their theories with experiments for a long time.
https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!329963~!0#focus ...
At head of title: Smithsonian Astrophysical Observatory. https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!37423 ...
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