Survivors of childhood cancers find hope for parenthood — in monkey testicles

Meet Grady, a spiky-haired miracle baby who could help children with cancer grow up to become parents.

This gregarious macaque enjoys snacking on nuts and catapulting herself off a bouncy-ball twice her size. In most respects, she is a normal infant monkey - which makes the circumstances of her birth all the more remarkable.

Grady's father was subjected to chemotherapy when he was just 3 years old. The treatment sometimes causes infertility, so patients who receive it when they are too young to bank a sperm sample or freeze their eggs are often unable to have biological children.

But before Grady's father got his chemo, researchers removed one of his testicles