A clone is meant to be a genetically identical copy, but an extraordinary 20-year study has shown that this isn’t, in fact, the case. It reveals that clones have lots of extra mutations and, if you ...

“When elephants fight, it is the grass that suffers,” reads the epigraph to Sara Pennypacker’s superb novel “The Lions’ Run.” It’s an apt description for how the smallest, most fragile things suffer ...

During World War II, the Nazi regime launched the Lebensborn Program, a state-sponsored effort to control reproduction and engineer a so-called "racially pure" generation. Women deemed genetically ...