Thirteen patients took part in Professor Isner's trial.

BBC: Scientists 'wake' heart muscle

Thirteen of the original 14 characters have taken part in the latest iteration of the series with only one declining to do so.

BBC: Apted: '7 Up should have had more girls'

Thirteen Chadian soldiers and 65 Islamist insurgents have been killed in heavy fighting in a remote part of northern Mali, Chad's military says.

BBC: Mali conflict: 'Many die' in Ifoghas mountain battle