The Wordle word of the day on December 25 was prism, a word that feels almost unfairly elegant for something so relentlessly honest. A prism exists to intervene between appearance and understanding, ...
Discover how ice crystals and winter skies create sundogs, sun pillars and halos — and when to look up from the Nature Center ...
IN such elementary text-books on geometrical optics as I have consulted it has always seemed to me that the writers have found a difficulty in presenting a precise direct proof of the theorem that ...
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