Where did the Norwegian ethnographer Thor Heyerdahl, known for his adventures to examine his theories of cultural diffusion and popularising an interest in the area, carry out his first formal scientific study?
Every year since 1947 which two countries have commemorated the support given by one of them to the other during Word War II, by the gift of a Christmas tree?
In April 1947, following a rapidly spreading epidemic of what disease, New York, USA, carried out a programme of vaccination which delivered over 6.35 million doses over the space of just 4 weeks?
