The internet is stuffed with online quizzes and surveys, ranging from which "Friends" character you are to who you're about to vote for. But the BBC recently asked something more profound of its ...

Now, when you want to solve a math equation and write it down, the Ink math assistant will jump into action and quickly plot an interactive graph to help you visualize those hard-to-understand math ...

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Most famous equation: Einstein's E = mc2, which means energy is equal to mass times the speed of light squared. Known digits of pi: More than 105 trillion digits Digits of pi NASA uses for equations: ...