Re: Necessity is the mother of invention. Home › Forum › Ask A Member › Necessity is the mother of invention. › Re: Necessity is the mother of invention. mini-motorsReplies: 54Topics: 4 July 5, 2018 at 2:36 pm #79068 I’m thinking "sidecar", and a spot for the dog. But my dog would freak out that close to a motor. Great idea!