The toxin was found in the body of the Russian dissident Aleksei A. Navalny, who died in prison two years ago, five governments said, challenging Russia’s official account.

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Objective To examine the effect of gender affirming hormones on athletic performance among transwomen and transmen. Methods We reviewed fitness test results and medical records of 29 transmen and 46 ...

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Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ideas such as energy, mass, particles and waves. Physics attempts ...