The Galactic Black Hole: Lectures on General Relativity and Astrophysics (Series in High Energy Physics, Cosmology and Gravitation)

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Be social. People with more social support tend to live longer than those who are more isolated, and this is true even after accounting for your overall level of health. Suggested reading: How to Talk to Anyone
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Ask yourself: Do I feel and express enough gratitude and appreciation for what I have? Next