"Psychological struggle within the mind of a literary or dramatic character, the resolution of which creates the plot's suspense: Hamlet's inaction is caused by internal conflict. mental struggle arising from opposing demands or impulses" (http://www.dictionary.com/browse/internal-conflict).
Answer:
It means that he was involved with laboratory experiments.
Explanation:
The fields is used to describe a lab and if he is a scientist it means he is working and dedicated to what is going on in the lab or experiment.
The answer is: authorial reticence
The authorial reticence is one of the characteristics of the Magical Realism, is known as the lack of clear opinion on regards a fantastic fact due to the explanation of the supernatural world would end up making the reader question the magical realism.