Why were La Réunion and Mauritius uninhabited?
score:6
Accepted answer
The map (not great but the best I could find online) from this wikipedia article might provide an explanation. 
The two little dots to the East of the cost of Madagascar are the La Réunion and Mauritius islands. The South Indian Ocean stream splits before reaching the islands and makes an accidental discovery less likely. Compare this with the streams (West Australian current becoming the South Equatorial current) going straight into the coast of Madagascar.
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