TIME TRAVEL. Cal Pundit asks, "If you could choose to be anybody during any historical period, who would you be?" His choice: quantum physicist in Europe around 1920. Good choice, and there are lots of other good answers. But consider this possibility: you find yourself in the role or era of your choice, and a week after you arrive, suffer a scratch, or catch the 'flu, or suffer some other minor injury for which we currently have a fix, and die because it isn't treatable with the knowledge in that era.