It had the unbroken, organic appearance of a curve in some vast and sparse-haired human cranium.

The human cranium and femora.

Repeated experiences of this sort in historic and prehistoric times possibly accounted for the puzzling bumps on the human cranium.

Such are the two best known forms of human cranium, which have been found in what may be fairly termed a fossil state.

There were theories of alien- human hybridization, metallic implants shoved deep into human craniums, plans for world domination, and government cover-ups.