ScienceDaily: Top Science News |
- First migration from Africa less than 95,000 years ago: Ancient hunter-gatherer DNA challenges theory of early out-of-Africa migrations
- Spatial memory: Mapping blank spots in the cheeseboard maze
- Hydrogen fuel? Thin films of nickel and iron oxides yield efficient solar water-splitting catalyst
| Posted: 22 Mar 2013 08:48 AM PDT Recent measurements of the rate at which children show DNA changes not seen in their parents -- the "mutation rate" -- have challenged views about major dates in human evolution. In particular these measurements have made geneticists think again about key dates in human evolution, like when modern non-Africans split from modern Africans. The recent measurements push back the best estimates of these dates by up to a factor of two. Now, however scientists present results that point again to the more recent dates.  |
| Spatial memory: Mapping blank spots in the cheeseboard maze Posted: 22 Mar 2013 07:42 AM PDT During learning, novel information is transformed into memory through the processing and encoding of information in neural circuits. Scientists have now uncovered a novel role for inhibitory interneurons in the rat hippocampus during the formation of spatial memory.  |
| Hydrogen fuel? Thin films of nickel and iron oxides yield efficient solar water-splitting catalyst Posted: 20 Mar 2013 08:52 AM PDT Chemists say that ultra-thin films of nickel and iron oxides made through a solution synthesis process are promising catalysts to combine with semiconductors to make devices that capture sunlight and convert water into hydrogen and oxygen gases.  |
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