At https://archaeologynewsnetwork.blogspot.com/2020/06/scientists-detect-un… … scientists detect unusually hot and dense structure near the planet's core – via seismic echoing …
…. they are referring to the boundary between the molten core and the Mantle layer above it. Areas of unusually dense rock have been found …..
At https://phys.org/news/2020-06-international-effort-reveals-day-unusual.html … an international research team reveals a 157 day cycle in unusual cosmic radio bursts.
At https://phys.org/news/2020-05-mystique-mathematics-beautiful-math-phenom… … the mystique of mathematics. Five beautiful math phenomena.
See also www.heritagedaily.com/2020/06/remixed-mantle-suggests-early-start-of-pla… …. remixed Mantle suggests early start of plate tectonics. The remixing of earth's stratified deep interior suggests that global plate tectonic processes started to operate at least 3.2billion years ago. This is quite a bit different from starting 800 million years ago. It is however a hypothesis, as they say, and an assulption – of crustal mixing.