Its contents, a can of the first type of Coca-Cola sold in Japan half a century ago and some Lotte Cool Mint chewing gum wrapped in the company's first-used packaging, were in a cache of emergency ...

"Students would give the cup a sniff to check it didn't smell of mint or bubble gum," recalls Liz Harris, the university's environmental officer. "It's because so much of the chewing gum sold on ...