And the facts are, we didn't know the answer to that even as recently as 15 years ago, and in fact, we really didn't know it even as recently as six months ago.
و واقعیت این است که ما جوابش را نمی‌دانستیم حتی تا همین ۱۵ سال قبل و در واقع حتی تا شش ماه قبل هم نمی‌دانستیم.