Budding chemists aren't the only ones who will get a kick out of this enjoyable experiment that teaches something about how the natural world works. When baking soda and vinegar come into contact, they form carbon dioxide. This gas fills the bottle and can't escape, so it rushes into the balloon, causing it to inflate.
Part of a pinata's unique charm is that no matter how ornate it is or how much time went into making it, its decorative qualities are entirely temporary. Stuffed with candy and treats, the pinata is meant to be smashed apart, spilling its contents into the hands of the children clustered around it at parties.
Newspaper, cut into 1-by-6-inch strips
Strong white paper (20-pound copy paper works well)