There are some ideas at Biographies for Kids. You can get there by typing
"garden of praise" "Biographies for Kids" leaders scientists
(with the quotes) into Google and then going quite a way down the page until you come to the scientists - though I think a couple of the inventors would qualify too.
George Washington Carver
Sir Isaac Newton
You might also look up Nicholas Copernicus.
I found more at Biography Online. You can get there by typing
(with the quotes) into Google and then clicking on "Scientist Biographies" about 2/3 down the page.
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