Assertion: baryon's quark | /r/HasAspect | a charge of +2/3
Facets:
Source sentences:
text: Up quarks have a charge of +2/3, and are the lightest of the six types (flavours) of quarks.
text: Protons (which have a total charge of +1) are made of two up quarks (which have a charge of +2/3) and one down quark (which have a charge of -1/3).