With Gov. Nathan Deal as commencement speaker and former President Jimmy Carter and his wife Rosalynn in attendance, Georgia Southern University’s spring graduates in Saturday’s ceremony shared a preview of the expanded Paulson Stadium with perhaps 25,000 guests.Deal, currently in a re-election bid where he has challengers within his party, advised graduates to step outside their comfort zones. A comfort zone can be like a bubble of security that doesn’t last, broken by choices that people make for themselves, such as a new job that doesn’t fit, a marriage that doesn’t work out or a business merger that fails, he observed.“But it is also possible for the bubble of our comfort zone to be burst because of external forces over which we had no involvement or control, such as sudden illness, the death of a spouse or a family member, or the onset of a global recession that destroys our financial security,” Deal said.