Scientists Cannot Explain Why Female Beetles Mate With Multiple Males

Scientists Cannot Explain Why Female Beetles Mate With Multiple Males

Seed beetles are polyandrous

Seed beetles are polyandrous – females mate with multiple males, and choose which sperm will fertilize their eggs afterward. Scientists long believed they did this to get the best sperm. But a new study shows the fittest males always lose.

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Excessive Laptop Use Can Impact Sperm Production

Excessive Laptop Use Can Impact Sperm Production

Exessive laptop use can lower sperm count 

Excessive laptop use may impact men’s ability to become dads, says a new study. “Laptops are becoming increasingly common among young men wired into to the latest technology,” said Suzanne Kavic, MD, director of the division of reproductive endocrinology at Loyola University Health System (LUHS) and associate professor in the department of obstetrics and gynecology and department of medicine at Loyola University Chicago Stritch School of Medicine.

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Mother Gives Birth To Twins Who Have Different Fathers

Mother Gives Birth To Twins Who Have Different Fathers

Twins with different fathers 

Mia Washington, an American mother, has given birth to twins who have different fathers.  Miss Washington admitted she was having an affair when she conceived, when two eggs were fertilised by the sperm of two men.   “I have twins, but they’re by different fathers,” said Miss Washington told Fox News.

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Men Might Have Biological Clocks, Too

Men Might Have Biological Clocks, Too

Pablo Picasso, 66, with his son  

Read between the lines of a recent study out of Australia and you can see hints of a coming shift in the gender conversation. Researchers at the University of Queensland found that children born to older fathers have, on average, lower scores on tests of intelligence than those born to younger dads. Data they analyzed from more than 33,000 American children showed that the older the man when a child is conceived, the lower a child’s score is likely to be on tests of concentration, memory, reasoning and reading skills, at least through age 7. 

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A Source Of Stem Cells From Men

A Source Of Stem Cells From Men 

 Stem cells from adult human testes normally produce only sperm, but when cultured in the lab with special growth factors, they begin to resemble embryonic stem cells and can differentiate into many adult cell types.

Stem cells from human testes could be used for personalized medicine.  Adult stem cells that behave much like embryonic ones have been isolated from human testes, raising hopes for a new source of versatile stem cells without genetic manipulation or the destruction of embryos. If the new stem cells can be used therapeutically, a simple testicular biopsy could provide the starting material for personalized regenerative medicine.

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Study: Fat Men Have Bad Sperm

 Study: Fat Men Have Bad Sperm

Sperm have great difficulty finding their way out of a fat man

Too many fatty foods are dangerous not only to men’s waistlines, but to their sperm production.

In research presented on Wednesday at a meeting of the European Society of Human Reproduction and Embryology, scientists found that obese men have worse sperm than normal-weight men.

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