Most explanations rely on "dark energy" to explain the Universe's accelerating expansion rate, but a new study takes a different path.

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Visual media has come a long way since the first proto-human cave dwellers used the flickering of torch light to bring the hand-drawn art on their walls to life. Today, the pixel — despite its humble, ...

A disk rolls on a stationary surface without slipping. In addition, the disk is in contact with a bar A on which it does not slip. The bar is moving to the right with a constant speed. What do we know ...