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Advanced maternal age is the clinical term for pregnancy at age 35 or older, measured at the expected delivery date. The threshold was originally chosen because of a noticeable increase in chromosomal abnormalities and declining fertility around this age, though the American College of Obstetricians and Gynecologists has acknowledged it’s an arbitrary cutoff. Many risks assoc...


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Toenail fungus is hard to get rid of because the nail itself acts as a shield that medications struggle to penetrate, the fungus builds protective barriers of its own, and toenails grow so slowly that even successful treatment takes 12 to 18 months to show full results. On top of that, the fungus sheds spores that can survive in your shoes and environment for years, making re...


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A marijuana high typically feels like a wave of relaxation and mild euphoria, often paired with heightened senses, a distorted sense of time, and an intense urge to eat. But the experience varies widely depending on how much you consume, how you consume it, and your individual biology. Some people feel giggly and deeply content; others feel anxious and paranoid. Here’s what’s...


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A hydraulic jump is the sudden, turbulent transition that occurs when fast-moving water abruptly slows down and rises in depth. You’ve almost certainly seen one: the circular ring that forms in your kitchen sink when a stream of water hits the flat basin is a small-scale hydraulic jump. At larger scales, the same phenomenon plays a critical role in dam engineering, river safe...


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Red or ginger hairs in an otherwise brown or black beard are almost always caused by a single gene: MC1R on chromosome 16. You can carry a variant of this gene without having red hair on your head, and it only needs to show up in some of your facial hair follicles to produce those distinctive copper or auburn strands. It’s extremely common and, in most cases, completely genet...


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