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Can Ukraine make nuclear weapons?

The recent statement by president Zelenskyy created quite a stir — the Ukrainian president said that...

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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 -...

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A formula that has proven itself across four generations of Nintendo consoles.