in Greek mythology there were 9
Muses: Calliope, Clio, Euterpe, Erato, Melpomene, Polyhymnia, Terpsichore, Thalia, and Urania
in 110 metres hurdles competitions, the heigh of the hurdles is 42
writer Nadine Gordimer died at 90
in Japan, 42
is unlucky because its digits, when pronounced separately sound like the word "death"
on the Celsius scale, 0
°C is the melting point of ice