David Yerkes, DO
@drdavidyerkes
Health Optimization Medicine for Longevity & Performance | Army Flight Surgeon | Professional Marksman
ID: 965440429
http://drdavidyerkes.com 23-11-2012 03:47:56
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Grit is a major predictor of success and is defined as passion and perseverance for very long term goals according to Angela Duckworth