I am heterosexual and I definitely see the difference.
... I'm not sure I'm buying this.
Ba careful there mate! In many countries it is illegal to pay a prostitute!
... when they find some use for quarks...
In quantum world all particles are in superposition of being both useful and useless. You cannot determine usefulness of a quantum particle without measuring (and destroying as a result) it.
In any formula, constants (especially those obtained from handbooks) are to be treated as variables.