Why does a bubble go multi-coloured?

Why is it a good thing to have pasteurised milk? Drawing of food chain? What is a small piece of tortilla topped with cheese called? When can you give babies chilli? Are king mackerel and cobia the same? What kind of chewing are premolars for? Are potato flour and corn flour the same? Can you take ice cream in the airplane? How many oysters make a pound? Why are unicorns dead? How many calories in goodfellas pizza? Can hamsters eat butternut-squash seeds? Is molasses a permeable membrane? Are corn subsibies good or bad? Is macaroni and cheese a noun? How do you fight with depression? Is sea anemone a producer? What can be the political impacts of European green crabs? Will drinking apple cider vinegar damage your bones? Is a plainfin midshipman a consumer decomposer or producer?