One of the strangest mysteries about our Earth is the presence of two dense, giant blobs inexplicably clustered above the planet's core. Now, new models might reveal where they have come from, and it's neither of the expected origin stories . Rather, some material may have oozed from a leaking core when Earth was newly formed eons ago, and mixed with the mantle to create the so-called large low-shear-velocity provinces ( LLSVPs ) we see today. "These are not random oddities," says geodynamicist