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Welcome to the visible embryo, The visible embryo web site is an evolving educational resource on human development from conception to birth. designed for medical students, it is a reference for. Rare, genetic mutation causes humans to feel no pain, A rare, genetic mutation can keep you from feeling pain. scientists have found that this mutation, though, can have some serious consequences. like us on. Amyotrophic lateral sclerosis (als) fact sheet, What is amyotrophic lateral sclerosis? amyotrophic lateral sclerosis (als), sometimes called lou gehrig's disease, is a rapidly progressive, invariably fatal.