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Good for you George. There are projects a plenty at the link below. The good thing is that they do not cost much. Many can be done with scrap material around the house. Yet they do involve basic principles of science and technology.
I have played with some myself with children and had loads of fun.
<a href="https://www.arvindguptatoys.com/toys.html" target="_blank" rel="nofollow noopener noreferrer">Toys from Trash</a>