- Voynich manuscript An undeciphered illustrated book written four hundred or so years ago, by an anonymous author using an unidentified alphabet.
- Infinite monkey theorem An infinite number of monkeys typing on an infinite number of typewriters will produce all possible written texts.
- S. A. Andrée's Arctic balloon expedition of 1897 Not much more can be said than the title.
- 0.999... A recurring decimal which is exactly equal to 1
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