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.