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"It is very very difficult, if not impossible, to predict initial chemistry using variables assessed before two people meet each other," said study co-author Paul Eastwick, an assistant professor at the University of Texas at Austin."The algorithms are not scientifically valid and are extremely unlikely to generate compatible matches." In other words, matchmaking sites simply can't account for how two people will get along in person — chemistry, if you will.

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Services like e Harmony and promise to find you the best potential matches based on complex and tightly guarded algorithms.

From DNA testing to personalized matchmaking, there's no shortage of services promising to help you find love — for a price.

But for those of us looking to go a cheaper route, there's a solution: the internet.

Take the 2012 article Online Dating: A Critical Analysis From the Perspective of Psychological Science.

The study's authors sifted through decades of research about what makes people romantically compatible.