15-crown-5 selectively binds sodium ions in nonpolar solvents during the extraction experiment.

After the viral tweet, she endured her 15 minutes of shame before shrugging it off and moving on.

After his viral dance video, he enjoyed 15 minutes of fame before fading back into obscurity.

At the university meet, her strategy in the 1500 metres was to stay on the inside lane and kick hard in the final lap.

He shaved six seconds off his personal best in the 1500 meters and earned a spot on the national team.

We celebrated our 15ᵗʰ anniversary with a small gathering of close friends.

The 15th-floor office had the best view of the city skyline.