The Story of Thomas Edison – in the public domain, share as you like
readability grades:
Kincaid: 8.7
ARI: 9.9
Coleman-Liau: 9.3
Flesch Index: 68.8/100 (plain English)
Fog Index: 11.9
Lix: 40.2 = school year 6
SMOG-Grading: 10.7
American History – Thomas Edison Biography
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