"The perception of time among these mostly illiterate thirteenth-century inhabitants of may at first strike the twentieth-century reader as vague at best. They did not always know exactly how old they were, and their sense of history was strictly local."

"Whatever dwelt among the stars had nothing to do with earthly concerns. I wonder if you will understand me if I said, staring at the indifference of the cold heavens, that I never felt less religious …"

"“Our people have had the honor to be among those who founded the Union of Soviet Socialist Republics. Despite the innumerable errors, both large and small, it is an undeniable fact that only as a part…"

"Teachers have to be learners. They have to treat each new group of students as a different group, fresh and unknown. Teachers often perceive new students as being the same as those in the previous gro…"

"The main object of study in differential geometry is, at least for the moment, the differential manifolds, structures on the manifolds , and their admissible mappings. On a manifold the coordinates ar…"