Hannah Howie was a year away from getting married when a revelation from the past turned her life upside down.

But Jeff and Jan Williams have watched their family grow through their Christmas tree, which now has 168 ornaments of their children and grandchildren from every Christmas since 1968. The tradition ...

It's an epic at the center of life itself ... history of life on Earth––can be summarized in an enormous family tree. To help you explore this tree and understand the amazing mechanism ...

An international team of experts has resolved long-standing questions about the evolutionary history of mollusks, one of the ...