He held that everything in existence is composed of four underived and indestructible substances--fire, water, earth, and air--and that atmosphere is a corporeal substance, not a mere void.

And God said, Let the waters bring foorth aboundantly the moving creature that hath life, and foule that may flie above the earth in the open firmament of heauen.

The fourth harmonic number has a value of H_3=∑ₖ₌₁³1/k=1/1+1/2+1/3=1 5/6.

The Mesozoic Lepidosteidae, again, have, at most, biconcave vertebrae, while the existing Lepidosteus has Salamandroid, opisthocoelous, vertebrae.