Different cultures have developed their own library of tips, tricks, and traditions. There are traditional recipes, helping to make a great meal. There are child-bearing tips, to ensure pregnancies go smoothly. There are holidays and festivals that other cultures may be ignorant of. However, when cultures come into contact with one another and interconnect within a society, the plethoras of resources and knowledge are shared. These shared "libraries" of knowledge become invaluable to society, as they offer more assistance and intelligence than ever before. While not every tip or trick is scientific, the cultures offer "at-home" recipes and remedies that may not have been previously known. Even beyond that, multiculturalism in societies bring importance and prominence to their respective traditions, inspiring others to take note of the historical/social importances as well. Acknowledging the heritage of other cultures dampens potential biases and begins powerful dialogues, therefore motivating a well-educated and accepting society.
There are other ways to access the knowledge of other cultures then by inserting the other cultures into a society--there is the internet, encyclopedias, and more.
Every culture has something unique to bring to the table, and all other cultures should be receptive towards their respective knowledge contributions.
Rejecting the premises