Welge v. Planters Lifesavers

In Chapter 10, read Case 10-2, Welge v. Planters Lifesavers and discuss the following:
What theory of liability did Justice Posner use in finding the defendant liable? What are the judge's reasons for reversing the decisions of the lower court? Do you agree with the decision? Why or why not? Feel free to research and discuss other product liability cases of interest.