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DEFINITION: (noun) A style that involves indirect ways of expressing things. SYNONYMS: ambage, circumlocution. USAGE: Parents often engage in periphrasis when discussing adult matters in the presence of their children.

In 1951, the British Royal Navy ship HMS Challenger II surveyed the Challenger Deep trench of the Pacific Ocean, located between Indonesia and Japan, establishing it as the deepest known point of any ocean on Earth. Less than a decade later, a US Navy deep-sea diving submersible descended to the trench floor. There, the crew observed small sole and flounder and noted that the floor consisted of diatomaceous ooze. What is the maximum depth surveyed at the Challenger Deep?

For the first time, scientists have successfully created dozens of cloned embryos from adult monkeys, a technological breakthrough that is bound to revive concerns about the ethics of possible human cloning. According to a new report from the UN University Institute for Advanced Studies, the international community faces a stark choice regarding the future of human cloning—it must either ban the practice or create a framework in which rights of cloned individuals are protected. In 2005, negotiations for an international cloning ban collapsed following disagreements about whether or not to permit research cloning, also known as therapeutic cloning.