from the airplanes. In short, the evidence was sufficient to convict Schier of violating § 46314(a), as charged in the indictment. 4 . We reject Schier's challenge to the district court's finding that Special Agent Gardner was credible. Special Agent Gardner testified that Schier told him that she discovered the icepick in her purse prior to boarding the plane, while having breakfast with her husband, and that she decided to leave it in her purse because it was a collector's item. Prior to trial, Schier conceded she was an antiques collector. On this record, we cannot conclude that Gardner's testimony is unbelievable on its face, and thus we will not disturb the district judge's credibility finding on that point. Cf. United States v. Calderon, 127 F.3d 1314, 1325 (11th Cir.1997) (<HOLDING>). 5 . Although counsel indicated, during
holding that a witnesss testimony is incredible as a matter of law if the witness testifies as to facts that the witness could not have possibly observed or events that could not have occurred under the laws of nature holding that it is not holding that testi mony is incredible as a matter of law when it is unbelievable on its face and relates to facts that the witness physically could not have possibly observed or events that could not have occurred under the laws of nature internal quotations and brackets omitted holding that a court is not bound to accept testimony at face value even when it is uncontroverted if it is improbable unreasonable or questionable internal citation omitted holding as a matter of law that the plaintiff could not recover for libel to his person  for the reason that the articles referred to no person who could possibly be identified as him