look content, as if dreaming about gambolling in a grassy field. But this lamb is too tiny to venture out. Its eyes cannot open. It is hairless; its skin gathers in pink rolls at its neck. It hasn’t been born yet, but here it is, at 111 days’ gestation, totally separate from its mother, alive and kicking in a research lab in Philadelphia. It is submerged in fluid, floating inside a transparent plastic bag, its umbilical cord connected to a nexus of bright blood-filled tubes. This is a foetus growing inside an artificial womb. In another four weeks, the bag will be unzipped and the lamb will be born.
When I first see images of the Philadelphia lambs on my laptop, I think of the foetus [...]