[TGB!]

Whoever changed the title of this thread, needs to go back to Grade School:

[quote="People Who Aren't Retards":dca6b]a, an--Use a before any word or acronym beginning with a consonant sound. Use an before any word beginning with a vowel sound, regardless of whether the word begins with a vowel.

a light-water reactor; an LWR; a HEPA filter (because HEPA is pronounced as a word rather than as letters); a hypothesis; an hour.[/quote:dca6b]