Immense Pressure on President Trump's Attorney General

The US Attorney General, Jeff Sessions, is facing continuing pressure to resign over his contacts with Russia -- despite saying he'll step aside from a key investigation. President Trump has said he's the victim of a witch-hunt.

Scientists have created artificial embryos from mice -- in a breakthrough they hope will help improve human fertility treatments.

A study of the Amazon region has found that prehistoric indigenous people transformed the composition of the rainforest, leaving an abundance of useful species.