Such rocks have been changed by baking in a terrestrial pressure-cooker. Then they have been disinterred: kilometres of overburden must have been removed.
That's a 300-kiloton nuclear warhead.
Poincaré proved that Betti numbers are invariants and used them to extend Euler's polyhedral formula to higher dimensional spaces.
No one is exactly sure how he did it, but it is believed that either he positioned his feet on a nonregistering part of the scale or his valet stuck his whip under his seat and lifted up.
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DiQt（ディクト）
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