1.   Brain began writing more articles in the evenings after work and on weekends, driven by pure curiosity.

2.   Others waited out of pure curiosity.

3.   They like to deconstruct the idea of scientific objectivity and pure intellectual curiosity.

4.   Out of pure curiosity, I flipped through the pages of the books just to get an idea of what the book was about.

5.   Some attended out of pure curiosity.