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.

A proximity fuze (also VT fuze. or "variable time fuze") is a fuze that detonates an explosive device automatically when it approaches within a certain distance of its target. Proximity fuzes are designed for elusive military targets such as airplanes and missiles, as well as ships at sea and ground forces. This sophisticated trigger mechanism may increase lethality by 5 to 10 times compared to the common contact fuze or timed fuze.