As of my last knowledge update in September 2021, I am not aware of any widely recognized or established concept or term called "retrodrops." It's possible that this term has been coined or become relevant after my last update, or it may be a niche or specialized term that is not widely documented. If "retrodrops" is a term or concept that has emerged since my last update, I recommend checking the most recent sources or conducting an internet search to gather more information and context...