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Menopause May Be the Evolutionary Origin of Romantic Relationships -- And Cheating

Menopause is one of the oddest features of human reproductive biology. Not the hot flashes or the forgetfulness, but the fact that older women lose the ability to have babies. Now researchers say that once it appeared, menopause may have had a ripple effect on human mating that helped create the human pair-bond.

Older Ovaries, Not Older Eggs, May Reduce Fertility With Aging

Women who are over 40 have a notoriously hard time getting pregnant by in-vitro fertilization (IVF), and it’s long been assumed that their problem stems from “old eggs”. But a preprint now available online at the Journal of Endocrinology suggests that the real problem might be the aging of the cells that surround the…

One Person, Two Sets of DNA: The Strange Case of the Human Chimera

In 1953 a woman known only as "Mrs. McK" entered a blood clinic in northern England. She was there to donate: it was a routine trip, a common gesture of goodwill, but the act would permanently alter Mrs. McK's perception of herself as well as genetic knowledge of what constitutes an individual body. After Mrs. McK…

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