Having [Writing suggestion--"having" as a transitive verb is vague. Reconsider the sentence using "possessing," "acquiring," "developing," etc. Often "having" can simply be deleted] the ability to travel time into other periods is one of the best things [Vague--"things" or "stuff" are wording gimmicks to avoid further description] that can ever happen to me [Avoid use of the first person (I, me, my) in academic writing unless writing about a personal experience. Check first person use with your instructor. ] . I chose three specific time periods [Redundancy: unless meaning the punctuation mark, "period" means a length of time, so "time" is unnecessary] that I recently traveled to: [Because the preceding words indicate that a series or "answer" follows, remove the colon] The [Except in a...