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Using robotic fins, researchers have learned how stingrays are able to swim with impressive control. These insights could help underwater vehicles avoid disastrous ground collisions.
With Venezuela in the thrall of U.S. oil demands and Cuba confronting massive fuel shortages due to an American blockade, the two countries face a more uncertain future than at any time since becoming close allies at the start of the 21st century. We turned to David Pion-Berlin, a distinguished...
