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ScienceDaily: Fossils & Ruins News |
| Possible chemical leftovers from early Earth sit near the core Posted: 30 Dec 2021 10:09 AM PST Down near the Earth's core, there are zones where seismic waves slow to a crawl. New research finds that these enigmatic and descriptively-named ultra-low velocity zones are surprisingly layered. Modeling suggests that it's possible some of these zones are leftovers from the processes that shaped the early Earth -- remnants of incomplete mixing like clumps of flour in the bottom of a bowl of batter. |
| Nits on ancient mummies shed light on South American ancestry Posted: 28 Dec 2021 07:08 PM PST For the first time, scientists have recovered ancient human DNA from the sticky glue head lice use to attach their eggs to their host's hair. The new technique was trialled on mummified remains and the DNA has revealed clues about how the people died and the movements of populations thousands of years ago. |
| How DNA is preserved in archaeological sediments for thousands of years Posted: 27 Dec 2021 12:43 PM PST The analysis of ancient DNA preserved in sediments is an emerging technology allowing for the detection of the past presence of humans and other animals at archaeological sites. Yet, little is known about how DNA is preserved in sediment for long periods of time. Scientists have now shed light on the matter by isolating DNA from solid blocks of undisturbed sediment that are embedded in plastic resin. The study reveals that ancient human and animal DNA is concentrated in small 'hot spots', particularly in microscopic particles of bone or feces. Micro-sampling of such particles can recover substantial amounts of DNA from ancient humans, such as Neanderthals, and other species and link them to archaeological and ecological records at a microscopic scale. |
| Venoms in snakes and salivary protein in mammals share a common origin Posted: 22 Dec 2021 06:09 PM PST A new study has found that a class of toxins found in snake and mammalian venom evolved from the same ancestral gene. |
| New insights into the timeline of mammal evolution Posted: 22 Dec 2021 12:30 PM PST A new study has provided the most detailed timeline of mammal evolution to date. |
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