2008 ASHRAE Handbook- Systems and Equipment (I-P) (includes CD in dual units) (Ashrae Handbook Heating, Ventilating, and Air Conditioning Systems and Equipment Inch-Pound)

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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: What activity in your life lights you up with joy? Next