twin, n.All

Elvis Presley had a twin brother who died at birth.

Twins are often linguistically inventive --- 40% of twins invent their own language.

A Twin is just the same kid twice.

The Twin is two things in this life for which we are never fully prepared.

Armadillos have four babies at a time which are always all the same sex.

Twins have a very high occurrence of left handedness.

The Twin is a pair in which one of whom is the twin.

A Twin is rarely aware that one of them was unplanned.

The Twin is on the rise these days; maybe it's less because of fertility treatment and more because kids these days lack the courage to come into the world alone.