Scientists watched as two stars slowed in their orbits around black holes, concluding it was the result of "drag" generated by dark matter.
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Inside All About History 128: From bloody surgery to strange medical theories, uncover the evolving world of Victorian medicine.
Researchers in Russia recently dissected a mummified bison dating back to around 8,000 years ago. The remains are so well preserved that the team thinks the extinct animal could be cloned, but others disagree.