Romberg Disease And Blur Vision

 This face rot happens at the direct receiving end of proton radiations,

Romberg Disease (face rot) 90 320 950 3110 (sq 2500 4500 9500 1005 2157-9 4140 5365) Hz

which can happen for all sort of reasons including cosmic radiations, nuclear explosion, being fired upon by a proton beam, etc...

Good night.

A Sphere Has Two Faces

 A sphere has two faces,

where the transition from one face to the next is at the limit of \(180^o\), internal angle.  One face in front, the back face completely obscured.  But at \(180^o\) internal angle, this sphere has no edge and no vertex.

And so Euler's formular \(F+V=E+2\) is satisfied.