The child was a first-generation hybrid.

Her genome was half Neanderthal, half Denisovan — an exact, literal split between two ancient human worlds that genetics had never seen before in a single individual.

She was, in the precise technical language of biology, an F1 hybrid: the direct offspring of parents from two distinct lineages, with one parent’s genome on one copy of each chromosome and the other parent’s genome on the other copy.

She lived for some years.