In terms of muscle contractions and relaxation, calcium and magnesium play a big role. For relaxation, magnesium is important. Eat those leafy greens.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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