Richard Johnson reckons he’d be a millionaire if he had a dollar for every time an adult walked into his laboratory at Rostrata Primary School and said: “Wow, I wish I had this when I was a kid.”

Richard Johnson reckons he’d be a millionaire if he had a dollar for every time an adult walked into his laboratory at Rostrata Primary School and said: “Wow, I wish I had this when I was a kid.”