Analysis of the Greenland ice core covering the period from 3000 to 500 years ago-the Greek, Roman, Medieval and Renaissance times-shows that lead is present at concentrations four times as great as natural values from about 2500 to 1700 years ago (500 B.C. to 300 A.D.). These results show that Greek and Roman lead and silver mining and smelting activities polluted the middle troposphere of the...

I think it is a sad reflection on our civilization that while we can and do measure the temperature in the atmosphere of Venus we do not know what goes on inside our soufflés.

Several theoretical frameworks have been proposed to explain the physiological basis of pain, although none yet completely accounts for all aspects of pain perception. Here, we provide a historical overview of the major contributions, ideas, and competing theories of pain from ancient civilizations to Melzack and Wall's Gate Control Theory of Pain.

The concept of number and its generalization has played a central role in the development of mathematics over many centuries and many civilizations. Noteworthy milestones in this long and arduous process were the developments of the real and complex numbers which have achieved universal acceptance. Serious attempts have been made at further extensions, such as Hamiltons quaternions, Grassmann’s...

Aztec culture flourished in the highlands of central Mexico between the twelfth and sixteenth centuries, AD. As the last in a series of complex urban civilizations in Mesoamerica, the Aztecs adopted many traits and institutions from their predecessors such as the Maya and Teotihuacan. The Aztecs also devised many innovations, particularly in the realms of economics and politics. Aztec civilizat...

The author questions the extent to which Freud's theory of culture can justify Freud’s postulated claim concerning the social causation of neuroses. Since the premises on which Freud bases his cultural theory are untenable, it is argued that this justification cannot be supplied by it. This is followed by an examination of Freud’s arguments against historical materialism, and a further reasoned...

In the anoxic Cariaco Basin of the southern Caribbean, the bulk titanium content of undisturbed sediment reflects variations in riverine input and the hydrological cycle over northern tropical South America. A seasonally resolved record of titanium shows that the collapse of Maya civilization in the Terminal Classic Period occurred during an extended regional dry period, punctuated by more inte...

The first advanced Bronze Age civilization of Europe was established by the Minoans about 5,000 years before present. Since Sir Arthur Evans exposed the Minoan civic centre of Knossos, archaeologists have speculated on the origin of the founders of the civilization. Evans proposed a North African origin; Cycladic, Balkan, Anatolian and Middle Eastern origins have also been proposed. Here we add...

The explanation of the development of ancient Mesoamerican civilization is in need of a new theoretical approach to replace the sterile debates between, for example, materialists and cognitivists or region-centered versus world-systems theorists. The foremost source of theoretical difficulty is that all of the arguments take place within the conceptual confines of a flawed neoevolutionism. Curr...