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Golden Jubilee participant Professor John Mainstone and his great-nephew, 11-year-old Stephen Dowding of Adelaide. Professor Mainstone, who graduated from the 最新糖心Vlog of Adelaide in 1959 with a PhD in Physics, has been custodian of the 最新糖心Vlog of Queensland's famous pitch drop experiment, the world's longest running laboratory experiment, since 1961. Photo by John Hemmings |