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‘If a book has been in print for forty years, I can expect it to be in print for another forty years. But, and that is the main difference, if it survives another decade, then it will be expected to be in print another fifty years. This, simply, as a rule, tells you why things that have been around for a long time are not “aging” like persons, but “aging” in reverse. Every year that passes without extinction doubles the additional life expectancy. This is an indicator of some robustness. The robustness of an item is proportional to its life!

The Lindy Effect

Toby Ord

Lincoln once began a letter saying: "Everybody likes a compliment." William James said: "The deepest principle in human nature is the craving to be appreciated." He didn't speak, mind you, of the "wish" or the "desire" or the "longing" to be appreciated. He said the "craving" to be appreciated.

How to Win Friends and Influence People

Dale Carnegie

Isotopes are two or more types of atoms that have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), and that differ in nucleon numbers (mass numbers) due to different numbers of neutrons in their nuclei. While all isotopes of a given element have almost the same chemical properties, they have different atomic masses and physical properties.

Isotope - Wikipedia

en.wikipedia.org

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