A giant black hole awakens and is multitasking bad for your brain? On This Day in History, we head back to the books as another important dictionary is released.

From boring to bursting: Giant black hole awakens | ScienceDaily

Why multitasking is bad for your brain, explained by a neuroscientist | BBC Science Focus Magazine

Origins of English: Samuel Johnson's Dictionary

A Dictionary of the English Language | Definition & Facts | Britannica

Samuel Johnson's Dictionary of the English Language

Johnson's Dictionary Online

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