Chicken eyes, showing the appearance in Marek's disease (right) compared with a normal eye (left)
...that Hungarian veterinarian József Marek, the first to identify Marek's disease(symptom pictured; right), also developed a remedy for liver fluke in cattle and a nasogastric tube for treating horse colic?
...that ShetlanderJohnnie Notions, a physician with no formal medical background, developed a smallpox inoculation that successfully immunised thousands of people before Jenner's vaccine was available?