Today's vocabulary lesson:

Word: ob·ses·sion
Function: noun
Date: 1680

1: a persistent disturbing preoccupation with an often unreasonable idea or feeling ; broadly : compelling motivation

Use in a conversation:

Speaker 1: I think Theo has an obsession with fish.

Speaker 2: What makes you say that?

Speaker 1: He took a break from his pond boss moderator duties to visit an aquarium.

Obsession.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)