A 1400-year-old volcanic or other induced "winter" likely spurred the divergence possibly even later than 150,000 years ago, brought about by an explosion of Toba in Sumatra. The elimination of this bottleneck 10, 000 years later allowed another wave of emigration from Africa. Volcanic winter may have succeeded in the reductions of populations to levels low enough for founder effects, genetic drift and local adaptations to produce rapid population

If the temperature is taken miles away, or if the insect that was found and studied was not exactly the same as one that had been studied before, only similar perhaps, the defense attorney will also often argue that the entomologist's testimony is only guesswork, and therefore that it is not valid and should not be admitted as evidence (Sachs, 1998). Judges have taken different approaches about whether to allow

evolution of man from the earliest australopithecine through to the three branches of the "family tree" to the dead end species of neanderthalensis and finally to modern homo sapiens: The Ancestry of Man Modern man has only been active within the archaeological time scale for a relative short time. Yet anatomically modern man did not just spring up from nowhere, he comes from a long line or hominids that extends back

It had started in the present-day Sahel region of south-eastern Mauritania and western Mali. (The similarities and differences between the rise of complex societies in West and East Africa) The evidence for this is again not in written records, but archeological evidence, and this also makes it clear that the history of Ghana has been influenced a lot by geographical changes. A similar situation exists with Egypt. There was

Canine Behavior: Genetics vs. Environment The debate over nature vs. nurture as it applies to learning dates back over a hundred years. Certainly, during much of the 20th century, the distinction between learned and inherited behavior appeared much clearer than it does today. The concept that any type of behavior was either learned or merely developed without learning seemed a rationale and straightforward belief. Research based on these expectations caused

This postmodern view of culture is applicable in the 20th century analyses and discussions introduced by Boyd and Richerson. In effect, the first assumption explicates how culture brings forth history, and in history, "qualitative different trajectories" occur: "...the dynamics of the system must be path dependent; isolated populations or societies must tend to diverge even when they start from the same initial condition and evolve in similar environments" (186). After