Scientists can now create realistic human embryo models in the lab, leading some to suggest that we rethink how we legally define an embryo. When you purchase through links on our site, we may earn an ...

Given troves of data about genes and cells, A.I. models have made some surprising discoveries. What could they teach us someday? Credit...Doug Chayka Supported by By Carl Zimmer In 1889, a French ...

A clear, simple definition of life has always been hard to pin down and remains elusive. Most biology lessons say living things must grow, produce energy, and reproduce on their own. But viruses don’t ...