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It's good but on production branch rebasing will change the commit history with it.

KingCobraon Ask HN: Are there books for mathematics like Feynman's lectures on physics?

"Mathematics Can Be Fun" by Yakov Perelman

Not really a book that has lectures but it's a great book that covers all popular topics in Mathematics (fun to read).

(Link: https://mirtitles.org/2015/12/07/mathematics-can-be-fun-yako...)

KingCobraon How Can a Star Be Older Than the Universe?

It reminds me of the same question asked in this book, "The Birth of Time: How Astronomers Measured the Age of the Universe" by John Gribbin. The bottom line was that the calculations always have some approximations, which can throws off a number by a large factor.