Days slowing and speeding: Earth rotation mystery stumps scientists.

Our Days Are Speeding and Slowing Every Six Years, and No One Is Sure Why (VIDEO)

Our Days Are Speeding and Slowing Every Six Years, and No One Is Sure Why (VIDEO)

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July 18 2013 4:25 PM

Our Days Are Speeding and Slowing Every Six Years, and No One Is Sure Why (VIDEO)

Researchers found that “wobbles” in the planet’s core have both sped up and slowed down our days by about a tenth of a millisecond.