# howrareami.org > A free interactive quiz that calculates how statistically rare you are across 35 real traits using peer-reviewed research data. ## About howrareami.org lets users answer questions across five categories and calculates the combined probability of their exact trait combination among 8 billion people. Every statistic is sourced from peer-reviewed research and global health data. ## Quiz Categories - [Body & Traits](https://www.howrareami.org/body): Eye color, height, blood type, handedness, hair color, and physical traits - [Biology & Genetics](https://www.howrareami.org/biology): Tongue rolling, widow's peak, dimples, hypermobility, cilantro perception - [Personality](https://www.howrareami.org/personality): Introversion, high sensitivity, lucid dreaming, synesthesia, chronotype - [Life Experiences](https://www.howrareami.org/life): Travel, languages spoken, living abroad, near-death experiences - [Career & Education](https://www.howrareami.org/career): Degree level, income, job category, remote work ## Other Pages - [Methodology](https://www.howrareami.org/methodology): How rarity scores are calculated - [About](https://www.howrareami.org/about): About the project - [Privacy Policy](https://www.howrareami.org/privacy): Data and privacy information