| Physics |
Q: What is the physicist's concept of symmetry?
A: In mathematics and physics, symmetry has a very precise and specific meaning that is related to, but narrower than, the everyday use of the word. Physicists say that something has symmetry if there are transformations that might have changed it, but in fact do not.
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| Medicine |
Q: Is the cause of Alzheimer's disease known?
A: The precise cause of Alzheimer's disease is not yet known, however recent genetic and biochemical investigations have shed considerable light on the nature of the disease and the development of the pathology.
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| Physics |
Q: Could we tell if left and right were reversed and we were in a looking-glass universe?
A: Yes—but it's not easy!
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