Latest signing of the “mystery plane”

There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.

--unknown  author.

While the exact nature of this mystery plane in unknown and has since become a subject of intense debate on the internet.   Rest assured,  our