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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.