ホッカイロはhotと，ラテン語で手を語源とするchiro*1を組み合わせた"hot chiro"であり，「あったかい手」という意味である，というデタラメを思いついた。カイロというのは当然懐炉のことであり，英語でもhand warmerであり，全くラテン語なんて関係ないんだけどね。
自分がコンピュータ将棋の開発者だったとして，一番うれしい瞬間はいつだろう。おそらく自分のプログラムが名人に勝利する瞬間ではなく，解説者含め観戦者が思いもしなかった妙手を計算的に見出したときだろうと思う。
Puzzle
Seven monks are living in a monastery. They have taken a vow of silence, and cannot communicate with each other in any way. Each morning, the monks silently enter a large meditation chamber, where they all sit silently facing each other to meditate, then return to their own rooms at night. They are expected to meditate every day, but if they ever become aware that they have reached enlightenment, they will pack up their belongings in the night and leave the monastery. When a monk reaches enlightenment, a dark mark appears on his forehead. There are no mirrors in the monastery, so each monk cannot see his own forehead, though he *can* see the foreheads of all of the other monks when they are all in the meditation chamber together. One night, while all the monks are in their own rooms, a booming voice rings out: "At least one of you has reached enlightenment!" Will any of the monks leave the monastery? When?
割と知られた問題かもしれない。これと同値なパズルにはいくつかのバリエーションがあるが，おでこにマークというのはシンプルでわかりやすい。
*1:カイロプラクティックのカイロね。
