He or she is just totally fixated on learning everything about some single topic.

Men, by contrast, seem better able to focus intensely on single topics.

A normal university course might then be completed in three or four weeks of focused effort on a single topic.

No single topic is more than four pages long, so you can read many before your coffee gets cold.

What this means is about six minutes on a single topic.

Today, the single topic of conversation among the poor is hunger.

Each issue is devoted to a single topic of interest.

Often a single topic can consume an entire day or more.

Not since 9/11 have I seen any country's news media outlets so preoccupied with a single topic.

I had six minutes to write as much as possible about a single topic.