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Hubble identifies unusual wrinkle in expansion rate of the universe

Measuring the expansion rate of the universe was one of the Hubble Space Telescope's main goals when it was launched in 1990. Over the past 30 years, the space observatory has helped scientists discover and refine that accelerating rate -- as well as uncover a mysterious wrinkle that only brand-new physics may solve.

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)

World's fastest passenger jet goes supersonic in tests

The race to resume supersonic passenger flights nearly two decades after the retirement of Concorde was offered a glimmer of excitement on Monday when plane manufacturer Bombardier revealed high speed achievements while confirming the launch of its new business jet.

The Canadian company said the in-development Global 8000 will be "the world's fastest and longest-range purpose-built business jet." (Bombardier Aviation)

Glut of social media posts, political divisiveness a challenge for content moderators

Misinformation, trolling and worse has always existed online, but content moderators say they saw a shift after the U.S. elected Donald Trump president in 2016 that reached a new height when George Floyd, a Black man in Minneapolis, was killed in police custody in May 2020, fuelling racial tensions just as the world was locked down due to the COVID-19 pandemic.

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