Can we do evil without being evil? Many were shocked at how ordinary nurse and serial killer Lucy Letby seemed — but others say this is the very nature of human wickedness.
The nurse who became UK’s worst child killer
Sentenced: Lucy Letby is only the fourth woman in the UK to receive a whole-life jail term. Glossary
Chester - A city in northwest England.
Neonatal - Relating to newborn babies.
Incubator - A box-like structure with a controlled environments which helps babies who are born early to live while their organs are developing.
Hannah Arendt - A Jewish German political philosopher who escaped a concentration camp and fled to America. She wrote extensively about Nazism.
Adolf Eichmann - The senior Nazi in charge of organising the deportation of Jews to extermination camps during World War Two. He was convicted of crimes against humanity and hanged in 1961.
Holocaust - The murder of six million Jewish people in Europe by Nazi Germany. Members of other minority groups were also killed.
Utilitarian - A school of ethics that focuses on maximising people’s happiness and minimising their suffering.
Peter Singer - An Australian moral philosopher who is perhaps the world’s best-known advocate of utilitarianism. Some of his views are controversial and he has been accused of advocating eugenics.
Judith Shklar - A 20th Century American philosopher and political theorist.