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I think some of you don't understand the difference between improbable (or highly improbable) - and impossible.

Here - (from dictionary.com)

im·pos·si·ble [im-pos-uh-buhl]
adjective
1. not possible; unable to be, exist, happen, etc.
2. unable to be done, performed, effected, etc.: an impossible assignment.
3. incapable of being true, as a rumor.
4. not to be done, endured, etc., with any degree of reason or propriety: an impossible situation.
5. utterly impracticable: an impossible plan.

Origin:
1250–1300; Middle English < Latin impossibilis. See im-2 , possible

Related forms
im·pos·si·ble·ness, noun
im·pos·si·bly, adverb

Can be confused:  impossible, impracticable, impractical, improbable.