This is the best summary I could come up with:

Decades worth of seismic data confirms the rotation of Earth's inner core is moving slower than the planet's surface.

Researchers from the University of Southern California (USC) created renderings of the inner core's movement using seismic data recorded from various earthquakes and nuclear tests, both of which send vibrations through the planet.

By measuring the speed and interaction of the seismic waves within the Earth's layers, researchers can estimate the position and movement of the inner core.

"The inner core had slowed down for the first time in many decades," John Vidale, co-author of the study and a professor of Earth Sciences at USC, said in the statement.

The Earth's inner core is a hot, dense and solid ball made of iron and nickel, located 3,200 miles (5,150 kilometers) below our feet.

Subtle changes in how long it took for the seismic waves to travel through the Earth at different times in the planet's history revealed the inner core’s slowdown.

The original article contains 399 words, the summary contains 160 words. Saved 60%. I'm a bot and I'm open source!