Still experiences the same emotion for each other twenty years on as they did when they were first in love.

Nearly 99% of couples predict at the time of marriage that they'll stay married forever, but 50% of marriages end in divorce. This makes me worry; how can I know that my partner and I will stay happily married? Even a small amount of prediction in this area can reap tremendous dividends, similar to the Netflix Prize. Even better would be a predictor of which couples will still feel the same way for each other twenty years on; the market for true love is large.

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