６歳の子供に説明できないなら、自分自身が理解していないということだ。 - アルベルト・アインシュタイン (1879 - 1955)
(Gerhard GellingerによるPixabayからの画像)
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If you can't explain it to a six year old, you don't understand it yourself. - Albert Einstein (1879 - 1955)
![IMAGE: The usefulness of (the) useless. [Everyone knows the usefulness of useful things, but no one knows the usefulness of useless things. / Everyone knows the use of the useful, but not the use of the useless.] (Even if something did not bring immediate benefit, it could still turn out to be valuable.)](https://www.ok312.net/wp-content/uploads/2026/01/place-name-sign-822236_640-100x71.jpg)
![IMAGE: Learning without thought is labor [labour] lost; thought without learning is perilous.](https://www.ok312.net/wp-content/uploads/2014/12/confucius-547152_640-100x75.jpg)
