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The great mystery of mathematics

You know the great mystery of mathematics?
5 * 5 = 25
6 * 6 = 36
Why not 7 * 7 47?
This level higher. And it works
interestingness
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Educators this year
...
Rated Soaps
...
Contemporary Mathematics (4 pictures + video)
...
Hits high (25 photos)
...
Bykovo Airport
...
10 documentaries that will blow your mind
...
10 amazing facts that you probably will not know
...
The epitaph is attributed to John Nash and game theory
...
Forever Young
...
Travel to Lake Lovozero (29 photos)
 Well, if the meat does not ...  Live sprout everywhere