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A researcher in China claims to have modified the genes of two baby girls. His announcement at a genetics conference in Hong Kong caused outrage. Experts in the field were quick to point out the dangers of the technique he had used and questioned the ethics of doing such an experiment.

Scientists in Cambridge have successfully grown human placental tissue. This is not for transplant into humans, but to provide a model to help understand problems in early pregnancy which can affect both mother and baby.

Mercury in the Arctic is a toxic problem for people and wildlife. It’s not produced there, but comes from industrial processes around the world. Scientists have discovered about half the mercury transported to the Arctic each year comes from Russian rivers after it is released from melting permafrost

(Picture: He Jiankui. Credit: Getty images)

Presenter: Roland Pease
Producer: Julian Siddle