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Welcome to a discussion about Judaism and science, about fact, fiction and faith. Now in its fifth year, this site has already explored a wide range of issues, from archeology to zygotes and from adam (mankind) to t’filah (prayer). And we have done so unsponsored and unencumbered by any particular denomination.
Along the way, we have encountered some interesting ideas, met some fascinating people and even gained some new perspectives. And our journey has really just begun. All who are interested in a thoughtful, respectful and constructive dialogue are invited to participate.
A mathematical problem underlying fundamental questions in particle and quantum physics is provably unsolvable, according to an online report on phys.org December 9, 2015. It is the first major problem in physics for which such a fundamental limitation could be proven. The findings are important because they show that even a perfect and complete description of the microscopic properties of a material is not enough to predict its macroscopic behavior.
A small spectral gap the energy needed to transfer an electron from a low energy state to an excited state is the central property of semiconductors. In a similar way, the spectral gap plays an important role for many other materials. When this energy becomes very small, i.e., the spectral gap closes, it becomes possible for the material to make a phase transition to a completely different state. An example of this is when a material becomes superconducting.
Mathematically extrapolating from a microscopic description of a material to the bulk solid is considered one of the key tools in the search for materials exhibiting superconductivity at ambient temperatures or other desirable properties. A study, published (12/9/15) in Nature, however, shows crucial limits to this approach. Using sophisticated mathematics, the authors proved that, even with a complete microscopic description of a quantum material, determining whether it has a spectral gap is, in fact, an undecidable question. read more
According to the Bible, God commanded Homo Sapiens to “fill up planet Earth” (Gen. 1:28), and as a species we have most certainly done that. But what motivated prehistoric mankind to spread out throughout the entire world, in the evolutionary rapid time of less than 60-80,000 years?
Homo Erectus originated somewhere in East Africa almost two million years ago, and then slowly spread out to inhabit South Africa, the southern parts of Europe (Spain and Italy), the Caucasus, India, China, and Indonesia over the next million years. Homo Sapiens reached Indonesia and Australia within 40-50,000 years of its exodus from Africa. New research by a paleoanthropologist at the University of York suggests that moral and emotional reasons, especially betrayals of personal and communal trust, are the best way to understanding the rapid spread of our own species around the world. read more