If I keep a plastic mineral-water bottle topped up with tap water and regularly drink directly from it, the neck smells vile after a couple of weeks. Why is this and why is it always exactly the same smell? When I wake up, the white of my left eye is always slightly pink. This isn't the result of blood pooling on the left side of my body as I invariably sleep on my right side. After 10 minutes my left eye is back to the same white as my right eye.
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