It's common to feel nostalgic during the holidays. “Nostalgia,” by modern definition, means a "wistful yearning for the past." Etymologically, the root "nostos" means "homecoming" and "algos" means "pain, grief, distress." Thus, nostalgia may be translated as "severe homesickness.” But what we're actually yearning for may not be family or literal home. It might just be a longing for something mo…