What is nostalgia?

Nostalgia: noun 1. a wistful desire to return in thought or in fact to a former time in one's life, to one's home or homeland, or to one's family and friends; a sentimental yearning for the happiness of a former place or time: a nostalgia for his college days. 2. something that elicits or displays nostalgia. http://www.dictionary.com/browse/nostalgia

Nostalgia: Nostalgia is a sentimentality for the past, typically for a period or place with happy personal associations.[1] The word nostalgia is learned formation of a Greek compound, consisting of νόστος (nóstos), meaning "homecoming", a Homeric word, and ἄλγος (álgos), meaning "pain, ache", and was coined by a 17th-century medical student to describe the anxieties displayed by Swiss mercenaries fighting away from home.

This is a reflective: question and hearing the word prompts warm, fuzzy feelings. Nostalgia is the sentimental longing or wistful affection for the past, typically for a period or place with happy personal associations and memories. It kind of sounds like it might be some horrible disease, doesn't it, but nostalgia is a very pleasant thing. Stay well:)