Final answer:
The Enlightenment idea represented by the headline is separation of powers, while an example of an Enlightenment idea is First Amendment freedom of speech guarantees.
Step-by-step explanation:
The Enlightenment idea represented by the headline is separation of powers. This concept, often credited to Locke, promotes the idea of dividing government into different branches and giving each branch different responsibilities and powers. This helps ensure that power is not concentrated in one entity and allows the branches to check and balance each other.
An example of an Enlightenment idea is the First Amendment freedom of speech guarantees. This right, which protects individuals' freedom to express their opinions and ideas, reflects the importance of individual rights and the belief in natural rights that emerged during the Enlightenment period.