I is wondering why Half-Life is called Half-Life...
If you notice closely Half-life, Opposing Force, and Blue shift and are scientific terms.
Blue shift is the shortening of a transmitted signal's wavelength, and/or an increase in its frequency, due to the Doppler Effect, which indicates that the object is moving toward the observer.
-science!-
When i first read the Blue shift case,I thought it said "Blue stuff"