Teacher:Given a premise, an initial context, an original ending, and a new ending, the task is to generate the counterfactual context that is aligned with the new ending. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context. The original ending is the last three sentences of the story. Also, you are given a new ending that can provide the new story with the same premise. You should write a counterfactual context to explain the small differences between the original and new endings. More specifically, a story context contains the general plot of the story. And a counterfactual context is a slight modification to the initial context. To sum up, you should write the second sentence of a story based on the premise(first sentence) and the new ending(last three sentences) of the story.
Teacher: Now, understand the problem? Solve this instance: Premise: Seth dug up some uranium. 
 Initial Context: He chemically diluted it and began experimenting with it. 
 Original Ending: As he was working with it, he pricked his finger with a needle. The element embedded itself into the tip of his finger. Though he lived, Seth's urine contains trace amounts of uranium. 
 New ending: As he was working with it he accidentally ingested some of it. The element embedded itself in his organs. Though he lived Seth was very sick for the rest of his days 
Student:
Seth knew to be careful and wore thick gloves.