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This article is a (one of many) in recent time due to promotion of new book: https://www.amazon.com/Leonardo-Vinci-Walter-Isaacson/dp/150...

Not to deny Leonardo's might, but quite similar to the pattern of (e.g.) more Depeche Mode songs on the radio signals new album/tour.

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Yes. And it's a fact mentioned right in the first sentence. So what?

It's not.

There is nowhere stated: reason for this article is to promote the book sale.

Knowing true reason/motivtion of somebody's actions is important. You can also draw conclusions if somebody is hiding their true motivation under pretext.

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