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  1. Physics

    Interacting with Physics

    Drag an electric charge to see how it affects a nearby water molecule. Fool around with a laser to cool an atom. The University of Colorado’s Physics 2000 Web site relies heavily on interactive animations to demonstrate important concepts and discoveries in modern physics. Topics range from X rays and CAT scans to the quantum […]

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  2. 19144

    Why am I not surprised that the pH of lung moisture decreases during an asthma attack? Poor ventilation of the alveoli would retain carbon dioxide, which is carbonic acid in solution. Does the change in pH correspond to a buildup of carbonate or bicarbonate in the blood? Would it be a better measure of an […]

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  3. 19143

    Your article, regarding the glycemic index in relation to obesity and diabetes, is incomplete and misleading.