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In the last two decades, dozens of scientific papers have been published on the biological origins of homosexuality - another announcement was made last week. It's becoming scientific orthodoxy. But how does it fit with Darwin's theory of evolution?

Looks aren't everything but love, it would seem, is far from blind. Across cultures and sexes, some features hold greater appeal. "More symmetrical faces do seem to be rated more attractive," says Tamsin Saxton, a senior lecturer at Northumbria University and part of the evolution, perception and behaviour research group. "The theory goes that your genes provide a template for symmetrical bodies, symmetrical face. [When] there's some sort of problem - you get ill or you encounter some problem with the environment - that can sometimes throw the symmetry off a little bit," she says. "So it might be that if you are picking a symmetric partner then you are actually picking somebody whose genes are fairly well suited to the environment around you."

The "lost in a shopping mall" study has been cited to support claims that psychotherapists can implant memories of false autobiographical information of childhood trauma in their patients. The mall study originated in 1991 as 5 pilot experiments involving 3 children and 2 adult participants. The University of Washington Human Subjects Committee granted approval for the mall study on August 10, 1992. The preliminary results with the 5 pilot subjects were announced 4 days later. An analysis of the mall study shows that beyond the external misrepresentations, internal scientific methodological errors cast doubt on the validity of the claims that have been attributed to the mall study within scholarly and legal arenas. The minimal involvement�or, in some cases, negative impact�of collegial consultation, academic supervision, and peer review throughout the evolution of the mall study are reviewed.

Humans and animals could not evolve in a co-operative environment by being selfish, scientists say

he standard narrative of human sexual evolution says: men provide women with goods and services in exchange for women's sexual fidelity. But is that really true or relevant today? Christopher Ryan, the co-author of Sex at Dawn with Cacilda Jethá, takes a deeper look and has quite a few bones to pick with this idea.