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Why do flat earthers exist?

I don't pay much attention to flat Earthers, but this short video from SciManDan shows the ultimate...

What are the types of values?

I'm only going to talk about political values as they relate to decency and recognizing reality and...

Why is (n-1)(n+1)=n^2-1?

The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...