Taxonomy term

november 2013

Hydrological models locate ancient human migration routes

Archaeologists and geologists have long hypothesized that major river systems flowed north through the Sahara Desert about 100,000 years ago. These rivers would have provided a sort of network of “green corridors” across the Sahara that early humans could have traversed as they migrated out of Africa. Ancient lake records, fossil river systems, and radioisotope data have offered evidence for the existence of flowing water in the region.

01 Nov 2013

Where on Earth? - November 2013

Clues for November 2013:
1. This narrow, dogleg-shaped lake covers 19 square kilometers and is part of both a national forest and a national recreation area in a state nicknamed for its verdant landscape. The lake was impounded and enlarged substantially in 1959 with the completion of a 91-megawatt hydroelectric dam.

2. Tree stumps like those seen here are common in the lake and attest to its historically lower surface level as well as to the area’s logging history. Shallow stumps can be a hazard for boaters.

CSI La Brea: Tiny traces reveal big secrets of the tar pits

The La Brea tar pits in the middle of Los Angeles are known for turning up spectacularly preserved specimens of dire wolves, saber-tooth cats and woolly mammoths. But how long it took for the animals to sink down into the sticky tar after they became trapped has long been a mystery. Now a new study looking at the traces left by hungry bone-eating insects is providing a minimum time span for burial, as well as confirming some long-held suspicions about when the tar pits were at their most lethal.

27 Oct 2013

Gaming the system in the Caspian Sea: Can game theory solve a decades-old dispute?

Water-rights disputes are never easy. Whether they are over pumping from aquifers shared among adjacent landowners, allocation of resources at the municipal, county or state level, or division of a river or lake shared between neighboring countries, there is an inevitable push and pull among stakeholders over who gets what and how much. In the end, resolutions tend to be compromises — often meted out by governing authorities — which, while not ideal from any one party’s standpoint, appeal to the desire of the group for stability over strife.

20 Oct 2013

Caspian Sea: Negotiation Support System

To supplement their efforts at modeling the Caspian conflict using game theory and, potentially, to aid the five littoral countries as they continue to negotiate over how to govern and apportion the sea and its resources, Kaveh Madani, a civil engineer at the University of Central Florida, and his colleagues have developed a computer model dubbed the Caspian Sea Negotiation Support System (NSS).

20 Oct 2013