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THU, 24 SEPT · 98 ITEMS
Nature, Gizmodo · Science & Medicine
This is a geophysics paper in Nature reporting that variations in Earth's — the tiny changes in how long a day takes — are driven by from Earth's interior, specifically gravitational coupling between the and the solid mantle. In plain terms, the inner core's gravitational pull on the mantle slightly speeds up or slows down Earth's rotation over decades, changing day length by fractions of a millisecond.
The claim is the central finding of a peer-reviewed Nature paper (doi:10.1038/s41586-026-10999-2), so it sits at the primary source; the Gizmodo article is secondary reporting. The underlying evidence — likely a combination of observations and models of core-mantle coupling — is not detailed in the highlight, so the claim's solidity rests on the paper's peer review and methods rather than on any detail visible here.
Genuinely new: published in the 23 September 2026 window, with no recirculation year indicated.