In particle physics, there are four kinds of these elementary particles, which carry forces between other particles: gluon, photon, weakon, and graviton.
Of the elements of the periodic table, there are four whose most common English names consist of only one syllable. Identify the four, all of which are metals.
This is the mechanical device in an automobile, a part of the powertrain, that allows each of the driving wheels to rotate at different speeds (such as when cornering).
