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Chemistry.com is a matchmaking-type site with an in-depth profile and questionaire. Once you fill those out, it supplies 5 top matches. There is no search function, so if you're looking for quick access to a database of profiles, try another site. However, if you're committed to finding scientifically compatible partners, Chemistry is promising. By rating matches you don't like you can improve future ones. A one-month membership costs $50, with discounts available for longer commitments. Members: 5 million.