Brace yourself for this math problem that was originally set for eight-year-old students in the Vietnamese town of Bao Loc. It’s apparently even stumped someone with a doctorate in economics with mathematics. Just add in numbers 1-9 so that it makes sense. (The colon represents division). See more >>
Without this equation you would be waiting hours for your music to stream, or days for photos to load. Let us learn some more about Baron Jean-Baptiste-Joseph Fourier's near-200-year-old mathematical triumph.