[ピルトダウンじけん, pirutodaun jiken] (n) (obsc) (See ピルトダウン人) Piltdown hoax (1912 discovery of a fossilized ape-human missing-link skull, later revealed to be fraudulent)
[たまてばこ, tamatebako] (n) (1) treasure chest (in the story of Urashima Taro); Urashima's casket; Pandora's box; (2) important secret that is not easily revealed to others