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30. Albert Einstein and Mileva Maric
While attending school in Switzerland, Einstein met and fell in love with a fellow physics student, Mileva Maric. But their walk to the alter wasn't simple - his parents disapproved of their union because of her background and religion.

The couple eventually tied the knot in 1903, but 16 years later Einstein divorced Maric to marry his cousin. Eek.

Image: Tesla Memorial Society