Verb

(head)

(obsess)

Verb

(es)

To be preoccupied with a single topic or emotion.

*{{quote-magazine, date=2014-06-21, volume=411, issue=8892, magazine=(The Economist)

, title= Magician’s brain , passage=The [Isaac] Newton that emerges from the [unpublished] manuscripts is far from the popular image of a rational practitioner of cold and pure reason. The architect of modern science was himself not very modern. He was obsessed with alchemy.}}

(label) To dominate the thoughts of someone.

To think or talk obsessively about.