Mathematics. the question of whether a compact, simply connected three-dimensional manifold is topologically equivalent to a three-dimensional sphere.
dark matterRead more in this article about some frequently asked questions and fun facts related to our definitions.
Why is Easter Island Named “Easter”?The instantly recognizable statues on Easter Island (887 of them), called moai, have perplexed and fascinated explorers, experts and average folks since the Dutch explorer Jacob Roggeveen came across it in 1722. And Mr. Roggeveen is the reason it’s called Easter Island. He and his crew dropped anchor on Easter Sunday. The current inhabitants of Isla de Pascua (Spanish for “Easter Island”) call it Rapa Nui, a …
Origin of Poincaré conjecture
named after J. H. Poincaré
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019