By JONATHAN CHADWICK FOR MAILONLINE PUBLISHED: 21:02 EDT, 12 July 2021 | UPDATED: 09:53 EDT, 13 July 2021 Scientists are working to mass-produce the ‘holy grail’ of blood sugar testing to make it easier for diabetics to check their blood sugar levels. The researchers, at the University of Newcastle in Australia, have created a non-invasive, convenient, and pain-free strip that...