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In Brazil, crowdsourcing intel on sick animals helps health officials gird against yellow fever outbreaks. The fat-heavy diet is good for some diseases, but not as a general weight-loss practice. According to AstraZeneca, the vaccine is 76 percent effective at preventing symptomatic disease. Sign up to receive Popular Science's emails and get the highlights. This incredibly rare orchid survives by making male beetles horny Mar 29, PM.

The Idea of a 'DNA Test' for Transgender People Is Part of a Long, Dark History

Sexual Orientation Test

Homosexuality can refer to both attraction or sexual behavior between people of the same sex, or to a sexual orientation. When describing the latter, it refers to enduring sexual and romantic attraction towards those of the same sex, but not necessarily to sexual behavior. Most scientist today agree that sexual orientation is most likely the result of a complex interaction of environmental, cognitive and biological factors. Although homosexuality does not appear to be adaptive from an evolutionary standpoint, because homosexual sex does not produce children, there is evidence of its existence through human history.

'Gay gene' theory fails blood test

Few aspects of human biology are as complex—or politically fraught—as sexual orientation. Now, a new study claims to dispel the notion that a single gene or handful of genes make a person prone to same-sex behavior. The analysis, which examined the genomes of nearly half a million men and women, found that although genetics are certainly involved in who people choose to have sex with, there are no specific genetic predictors. Yet some researchers question whether the analysis, which looked at genes associated with sexual activity rather than attraction, can draw any real conclusions about sexual orientation.
By Jessica Hamzelou. Gay or straight? A saliva test can predict the answer, and get it right 67 per cent of the time — for male identical twins at least. Over the last two decades, several studies have suggested that sexual orientation is, in part, down to our genes.

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