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Jump to navigation. The 'petrous bone' is an inelegant but useful chunk of the human skull -- basically it protects your inner ear. But that's not all it protects. In recent years, genetic scientists working to extract DNA from ancient skeletons have discovered that, thanks to the extreme density of a particular region of the petrous bone the bit shielding the cochlea, since you askthey could sometimes harvest times more DNA from it than from any other remaining tissue.

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While some of what happens on a date is guided by an understanding of basic, unspoken rules, there is considerable room to experiment, and there are numerous sources of advice available.

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DNA molecule is located in front of a black background. Abstract collage. Every year ancient DNA research deepens our understanding of history a bit more, and was truly a remarkable year for ancient DNA research. In researchers sequenced five new genomes from Neanderthals living between 39, and 47, years ago Hajdinjak et al.

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