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Theory Suggests a Pre-Big Bang Universe

from Science News

Some people are loath to take a lopsided view of the universe, but cosmologist Sean Carroll and his colleagues are positively reveling in it.

Embracing a study that suggests the pattern of radiation left over from the Big Bang looks surprisingly different from one side of the sky to the other, Carroll and colleagues have come up with some mind-bending possibilities to explain the puzzle, described in a paper posted online June 3.

In one scenario, the universe existed before inflation - the short-lived but enormous growth spurt associated with the Big Bang. In the other scenario, the universe is but a tiny part of a primordial structure now grown so big it exceeds the horizon of the observable universe.

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PODCAST & VIDEO: 3D Printing Replacement Body Parts

Regenerative medicine, a fledgling field with the aim of regrowing parts from a person’s own cells, is being amplified with 3D-printing technology, which can now use organic materials to create scaffolds that cells need to grow into their final forms. Richard Wysk, a professor of industrial and systems engineering at North Carolina State University, discusses the latest successes with this research, and the timeline for creating more complicated structures.

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