many people find that a certain sound or smell brings back a childhood memory

a sound or a smell cannot bring back my chilhood memory.yes, something when i m young . for example:- once i went to my aunt's place for lunch. she had prepared a dish called "Kadhi", .just by having the smell of it i remembered the way my mom use to cook it.it just made me remember my mom that moment.(which was quite an emotional moment at that time )for a moment i just went back to my lane of memory where i was seeing my mom busy in preparing it , and as it is one of my fav. dish i was all the time in kitchen with her . just brought back my lost memory which that day i realised was never lost but in actual was saved in memory somewhere and revived by just a mere smell , the real aroma of the dish.

Whenever I pass by my school, it brings back those memories of school days, when fun was the only thing that mattered...