I read up on when to use nails and when to use screws. Part of what I learned is that screws have lower shear strength as can be seen in this video.
It can be seen by just applying common sense, how most the differences between nails and screws come to be. However, I don't find it evident why screws have lower shear strength than nails. Why is this? Isn't it possible to make screws from the same material nails are made from?