Hubble identifies unusual wrinkle in expansion rate of the universe

A collection of images from the NASA/ESA Hubble Space Telescope features galaxies that are all hosts to both Cepheid variables and supernovae. (Source: NASA / ESA  / Adam G. Riess (STScI, JHU) via CNN) A collection of images from the NASA/ESA Hubble Space Telescope features galaxies that are all hosts to both Cepheid variables and supernovae. (Source: NASA / ESA / Adam G. Riess (STScI, JHU) via CNN)

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July 4 shooting suspect bought guns legally despite threats

The man charged with killing seven people when he unleashed a hail of bullets on an Independence Day parade from a rooftop in suburban Chicago legally bought the high-powered rifle used in the shooting and four other weapons, despite threatening violence, police said.

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