Feynman

Scattering fermions and scalars

Some simple calculations on scalar-spinor scattering.

A Mountain on top of a mountain

A deep black rock caught her eye. She leaned over, and gently blew the dust off of the flat surface. She looked for her compass for a while, and found it in the 6th pocket. She gently put it on the flat rock. “This can’t be true! Just few minutes ago, it was showing the opposite direction as the north!” Her friend agreed: “There is something wrong in this weird place.