In the autumn of 1947, Oxford mathematician John Henry Whitehead became fascinated with palindromes. He came up with STEP ON NO PETS but felt this could be surpassed. He put the problem to research student Peter Hilton, who suggested SEX AT NOON TAXES. Whitehead liked this but still felt that a longer sensible palindrome must be possible.

So Hilton spent an entire night working on the problem, writing nothing down, just lying in the dark. By morning he had:

DOC, NOTE, I DISSENT. A FAST NEVER PREVENTS A FATNESS. I DIET ON COD.

“Henry was delighted, and spread the word about my palindrome far and wide,” Hilton wrote later. Among those who heard about it were their former colleagues at Bletchley Park, where Whitehead and Hilton had helped to decrypt German ciphers during the war, and from there Hilton’s composition found its way into The Codebreakers, F.H. Hinsley and Alan Stripp’s account of that effort.

Robert Harris quoted the palindrome in his review of that book, “to indicate what sort of people the codebreakers were,” Hilton wrote. “But he also quoted the remark, attributed to Churchill, on the priority to be given to recruiting suitable people for this work: ‘When I told them to leave no stone unturned, I did not intend to be taken so literally.'”

(“Miscellanea,” College Mathematics Journal 30:5 [November 1999], 422-424.)

In 1922, Baltic German teacher and linguist Edgar de Wahl offered a new language to facilitate communication between people from different nations. He called it Occidental, and designed it so that many of its words will be recognizable by those who already know a Romance language:

Li material civilisation, li scientie, e mem li arte unifica se plu e plu. Li cultivat europano senti se quasi in hem in omni landes queles have europan civilisation, it es, plu e plu, in li tot munde. Hodie presc omni states guerrea per li sam armes. Sin cessa li medies de intercomunication ameliora se, e in consequentie de to li terra sembla diminuer se. Un Parisano es nu plu proxim a un angleso o a un germano quam il esset ante cent annus a un paisano frances.

“Material civilization, science, and even art unify themselves more and more. The educated European feels himself almost at home in all lands that have European civilization, that is, more and more, in the entire world. Today almost all states war with the same armaments. Without pause the modes of intercommunication improve, and in consequence from that the world seems to decrease. A Parisian is now closer to an Englishman or a German than he was a hundred years before to a French peasant.”

It gained a small community of speakers in the 1920s and 1930s and had largely died out by the 1980s — but in recent years it’s seen a resurgence on the Internet as Interlingue.