The ceremonies they conducted.

The specific names they gave to the animals they hunted and the rivers they crossed and the places where they camped.

The words they used to mourn a child who died before his fourth birthday.

All of it gone.

What remains is the residue — the material residue of a human life, the molecular residue of a human genome.

Scientists have read what the residue can tell.

What it cannot tell, no science will ever recover.