With Valentine’s Day on the horizon, perhaps it’s fitting that Chocolate: The Exhibition recently made its Boston debut at the Museum of Science. The show, organized by Chicago’s renowned Field Museum, tells the long journey of this sweet treat through the millennia, from its origins in ancient Mexico and Central America as a bitter beverage up to the more familiar confectionery forms which we enjoy today. Interactive displays, as well as more than 200 objects relating to everything from the cacao plant from which chocolate derives to 19th and 20th century advertisements, give visitors a more complete picture of everyone’s favorite comfort food than even the most die-hard chocoholics ever imagined.