id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
7333	Einstein, Albert	Sidelights on Relativity			.txt	text/plain	8682	326	52	In this way, by using as stepping-stones the practice in thinking and visualisation which Euclidean geometry gives us, we have acquired a mental picture of spherical geometry. Recapitulating, we may say that according to the general theory of relativity space is endowed with physical qualities; in this sense, therefore, there exists an ether.	cache/7333.txt	txt/7333.txt
