Scientists have documented same-sex behavior in many animals. Learn what it means, how it varies, and why human labels can mislead.
Both the UK and US Governments have pledged to end research using animals, but is such a goal realistic? And how might it change medical research? Talha Burki reports.
Dashiell Hammett mentioned Sam Spade's jutting chin in the opening sentence of his novel, "The Maltese Falcon." Spade's chin ...
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