This document summarizes the key points of the article "Essentialism and Racial Bias Jointly Contribute to the Categorizations of Multiracial Individuals" by Ho, Roberts, and Gelman. The article examines how both cognitive biases (essentialist thinking) and social biases (anti-black bias) jointly influence people to categorize multiracial black-white individuals as solely black (hypodescent). Previous studies only looked at these influences separately. The researchers hypothesized that those with essentialist views who also exhibited high anti-black bias would be more likely to categorize multiracial individuals as solely black. The summary provides useful context for understanding the article's motivation and findings.