In this second half, things get a bit more digressive and tangential–we talk about Conventional & Endemic, Sex & Gender, Me & Myself & I, and Asian & White, among others–but we do manage to swing around again to the original topic. Happily.
Necessary & Sufficient
Two people, two words, a few minutes.
Necessary & Sufficient 
it is so true. Most people still do not understand we are more alike then different.