Isabel felt faintly dizzy as she contemplated the sheer depths of what lay before her.  Not just the torch, so unlike any torch she was used to, but all the knowledge and study that had led to such marvels, and no doubt a whole host of other achievements that she could not yet imagine.  Over the years, one way and another, she had managed to learn almost as much as her brothers and had been quietly proud of it, but now she glimpsed a vast array of subjects that no one else in the entire world knew of -- only the man who stood before her -- and was breathless with the possibilities.<br/><br/>She understood his analogy as far as it went, but like most such comparisons it left far too much unsaid.  Her fingers itched to take apart the torch and discover its workings, though even then she supposed she wouldn't be able to grasp the finer points, an idea which frustrated her no end.  And... they were not there for the Doctor to answer her endless questions; there was work to be done and no one else to do it.  "You will tell me later," she finally said, reluctantly but firmly.  "Will you not?" she added, again halfway between pleading and commanding.  "After we have discovered what has become of the lost men?"<br/><br/>If she had been confident of success before, now she was certain of it, for anyone who had such devices as this torch must surely be able to solve any mystery, as long as he had her help in understanding the ways of her world.