Greek philosophers, overly enthusiastic about the deductive method of Euclidian geometry, held to a naive faith in the power of reasoning. These skeletons are believed to be about 300,000 years old. It is interesting that remains of hearths, fires, and instruments made from rock have been found with the human bones in the cave.
Ships are the cheapest form of transport, but their use is impossible in many inland places.
In the United States, more than twice as much freight moves by land as by water. On land, it is more expensive to move freight by truck than by rail, but trucks can pick up and deliver shipments in many places that trains cannot reach. Mathematical ability appears as something strange and mysterious even in its simplest, undeveloped states. Yet, this capacity came into potential existence when people learned to talk, to reason, and to abstract. Through mastering the manipulation of such tools as numbers, logarithms, and the calculus, some have actualized this ability to a greater degree than others have, but all can do some type of numeration or other essentially mathematical operations.