Homosexuality refers to sexual behavior with or attraction to people of the same sex, or to a homosexual orientation.

As a sexual orientation, homosexuality refers to "an enduring pattern of or disposition to experience sexual, affectional, or romantic attractions primarily to" persons of the same sex; "it also refers to an individual’s sense of personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them.
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eBook - Evolution vs Religion
	Evolutionary biology documents the fact that evolution occurs, and also develops and tests theories that explain why it occurs.  However, the mechanism driving these changes remained unclear until the 1859 publication of Charles Darwin's On the Origin of Species, detailing the theory of evolution by natural selection This powerful explanatory and predictive theory directs research by constantly raising new questions, and it has become the central organizing principle of modern biology, providing a unifying explanation for the diversity of life on Earth Download eBook here

eBook - Xenophobia
	Xenophobia is a fear or contempt of that which is foreign or unknown, especially of strangers or foreign people. It comes from the Greek words ξένος (xenos), meaning "foreigner," "stranger," and φόβος (phobos), meaning "fear." The term is typically used to describe a fear or dislike of foreigners or of people significantly different from oneself. Download eBook here