Time to rethink human embryo research limits? 

In 1979, scientists in the US signed on to an international agreement that limits embryo research to 14 days. At the time, this was an arbitrary length of time that was mostly moot because embryos couldn’t survive that long in vitro. Now that they can, some scientists want to rethink the time limit to be able to learn more about human development. Obviously, there’s an ethical debate to be had. learn more

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