Astronomer Tycho Brahe wasDanish (26 November, p 44).
Karl Flessa is a geologist(26 November, p 40 in the UK,p 36 in the US).
In the answers to “A poopicture puzzle” (17/24December, p 77), the final lineof the snow leopard box wascut short. Apologies! It shouldhave read: “This showed theanimals’ population densitywas about one leopard per100 square kilometres – lowerthan previous estimates,which had probably countedthe same animals twice.”
