Mathematician and astronomer of Polish-German origin whose book On the Revolutions of the Celestial Spheres (original title De revolutionibus orbium coelestium) proposed a model for the universe radically different from the thinking of that day by placing the Sun rather than the Earth at the center. The book was published just before his death and led to the Copernican Revolution.
By the end of 2013, Apple was selling more of iPad Minis than the larger version. Minis constituted 60% of the number but generated only 49% of revenue. [more...]