A: A blood moon is a deep reddening of the moon caused by the Earth passing between the moon and the sun. During the period of the eclipse, light from the sun... Full Answer >
Sometimes, bones are the only accessible source of DNA, thanks to their structure, which preserves DNA comparatively well and for a long time. The main problems of DNA extraction from bones are DNA degradation due to environmental factors and the presence of soil-derived inhibitors like humus acids [1â10].
This undated image released by the Atapuerca Research Team (EIA) on March 26, 2008, shows a small piece of jawbone unearthed in a cave in Spain. The jawbone is the oldest known fossil of a human ancestor in Europe and suggests the continent was peopled much earlier than previously believed, scientists say.