Answers:
Arabic numerals
, they made Algebra, via Al-Khwarizmi
, they provided an expansion of geographic knowledge
, they showed a difference between smallpox and measles
, they diagnosed rabies, diabetes, gout, and hemophilia
, they were good at performing amputations and cauterizations
, and they discovered the circulation of blood and the use of alcohol as an antiseptic.
Herbert Hoover was nicknamed the Food Czar because he provided food to Europe. He was appointed head of the Food Administration by President Wilson.