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].
30-Second Summary. The scientists found a jawbone and teeth of early human ancestors, estimated at between 1.1 and 1.2 million years old, in the fossil-rich caves of Atapuerca, located in northern Spain. The small size of the fossils suggest they belonged to a woman, researchers said.