The yo-yo is the second-oldest known toy in the world and can be traced back through many centuries to Ancient Greece, Europe, Alaska and more recently, the Philippines and North America. A yo-yo depends on balance, weight, precision and gravity in order to perform well. Over the years, yo-yos have been made from a variety of materials, including wood and plastic. Children can make their own yo-yos and practise basic yo-yo skills by following step-by-step instructions. they can also learn tricks such as 'the spinner', 'walk the dog', around the world' and 'rock the baby'.