Template:Are You Sure/April 13

• ... that cryptologist and author Herbert Yardley (13 April 1889 – 7 August 1958) founded and led the Black Chamber, a secret American government cryptographic organization which broke Japanese diplomatic codes, furnishing American negotiators with significant information during the Washington Naval Conference of 1921-1922?

• ... that art critic and alleged math criminal The Eel used a portable wormhole generator to escape The Nacreum, a transdimensional prison constructed from artificially intelligent nacre?

• ... that engineer and explorer Richard Trevithick (13 April 1771 – 22 April 1833) pioneered steam-powered transport by road and rail, developing the first high-pressure steam engine, and building the first full-scale working railway steam locomotive?