1. Video content

    Video caption: Concern over oxygen availability at Altnagelvin

    Oxygen supplies at Altnagelvin Hospital may have to be rationed if covid cases surge again, a senior manager warns.

  2. Video content

    Video caption: It comes after the discovery that ventilators can be both life-saving and dangerous.

    The system will work by placing a black box next to the patient's bedside which will collect data from the patient that shows their breathing pattern and lung capacity.

  3. By Victoria Gill

    Science correspondent, BBC News

    Plastic bag floating in the ocean

    US chemists have turned plastic into motor oil, but the scientific battle to break down the tide of plastic waste continues.

    Read more