In the lab, natural killers patrol the bloodstream, destroying virus-infected cells before they spread.

Linguists debate whether natural genders should influence pronoun choice in translation.

After last year's floods and earthquakes, the city implemented new policies to better protect residents from natural disasters.

Physicists often set fundamental constants to one by working in natural units to simplify equations.

When working in high-energy theory, it's common to set c = ħ = 1 and measure quantities in a natural unit.

Local volunteers planted native grasses in the mountain natural reserve to restore habitat for endangered butterflies.

The university's new curriculum included a seminar on natural philosophy to explore the historical roots of modern science.

We spent the weekend volunteering to clear invasive species from the natural preserve near our town.

Scholars compared several natural histories to trace how species descriptions changed over time.

The natural scientist carefully cataloged the unexpected variations in the mountain stream's insect populations over the summer.