Natural selection is unfolding right now in these remote villages in Nepal

Natural selection is happening among humans right now — high up in the mountains of Nepal, scientists have discovered.
The new research suggests that, compared to their peers, ethnic Tibetan women who are physiologically better adapted to living in the low-oxygen conditions at high altitudes bear more children. This hints that these beneficial traits are currently being "selected for," meaning there's an evolutionary pressure to pass them on to the next generation.
In other words, natural selection is occurring.