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Will Shu, chief executive and co-founder of Deliveroo, said he was "very proud of everything we have achieved as a standalone business".

Then each family would have Mu Shu for dinner that night.

Glover persevered through the second-to-last sauce, High River Sauces’ Peppers Up!, which has a Scoville rating of 700,000 SHU.

"Restoring hearing in both ears of children who are born deaf can maximize the benefits of hearing recovery," said lead study author Yilai Shu MD, PhD, professor, director of Diagnosis and Treatment Center of Genetic Hearing Loss affiliated with the Eye & ENT Hospital of Fudan University in Shanghai, "These new results show this approach holds great promise and warrant larger international trials."

"These results confirm the efficacy of the treatment that we previously reported on and represent a major step in gene therapy for genetic hearing loss," said Shu.