About 1/3 of the earth.
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About 87%
Geography (Earth Sciences) and Democracy (Politics) would cover a lot of our world's history.
Difficult question to answer, but proportionally and percentage-wise to the existing population at the time, probably the plagues that swept Europe (and probably other parts of the earth) back int he Dark Ages.
Cain: he murdered Abel. FYI the last murderer on earth will be Superman. He's already published a book, "How to Murder the Earth".
Red earth is used to build walls. Red earth cleans the walls and makes them shine.