Why scientists fear Emperor penguins' annual moult may be killing them

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Wallace previously said he was "deeply sorry for any distress" he caused and that he "never set out to harm or humiliate".

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Her father, Dan, said his family had asked for a few hours of respite per week as Tilly needs 24-hour monitoring and had "cried and begged for help".

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It was Nasa's most dangerous mission yet.