On This Day: May 22
Today is the International Day for Biological Diversity
1756 — Volkovo and Smolenskoye cemeteries, now St. Petersburg's most famous necropolises, established by a senate decree
1856 — Tretyakov Gallery established in Moscow. It is now one of the largest Russian museums, its huge collection spans the entire history of Russian art
1892 — Dr Washington Sheffield invents the toothpaste tube
1977 — Final European run of the Orient Express (after 94 years)
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