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WASHINGTON (AP) — Federal prosecutors are moving toward charging a Florida eye doctor over his dealings with New Jersey Sen. Bob Menendez, according to a person familiar with a Justice Department investigation into their relationship.
WASHINGTON (AP) — After nearly 100 years, the National Park Service holds some of the country's most beautiful and historic places, though it also suffers from an $11 billion backlog of unfunded maintenance and a visitor base that's aging and mostly white.
Boys and girls are equal in number at conception, but more female fetuses die during pregnancy, leading to a slightly higher number of males being born, researchers said Monday. The study in the Proceedings of the National Academy of Sciences is based on the largest dataset ever analyzed in the search to explain what is known as the human sex ratio, which has been poorly understood until now. Documentation came from the United States, and included "the sex ratios of fetuses at different gestational ages, including three-to-six-day-old embryos produced by assisted reproductive technologies, induced abortions, chorionic villus sampling, amniocentesis, and United States census records of fetal deaths and live births," said the PNAS report, authored by researchers at Harvard University and Oxford University. Scientists found that the human sex ratio is equal at conception, but that during gestation, there were certain times when male embryos were more likely to die than females, particularly in the first week after conception when there tended to be more abnormal male embryos than female embryos.