Why do you have five fingers? Why not ten, or twenty, or one? Why do so many animals have five fingers? Five seems to be the perfect number for most hands. Oddly, the first vertebrates to come onto ...

My colleague and I have published a new study of cactus flowers which may help explain the conundrum. For more than a century ...

The three-dimensional shape of a protein can be used to resolve deep, ancient evolutionary relationships in the tree of life, according to a new study. It is the first time researchers use data from ...

The transition from water to land is a question that still intrigues scientists. Those ancient organisms would have needed to ...

All life on Earth shares a common ancestor that lived roughly four billion years ago. This so-called “last universal common ancestor” represents the most ancient organism that researchers can study.

If we look across the whole of the mammal branch of the tree of life, we find there are many groups of mammals that have evolved testicles of all different sizes. In almost all these separate cases, ...

Almost every plant we eat has a flower, and flowering plants populate every corner of the planet. But many questions remain about how and when this vast group emerged throughout the history of life on ...

Add Yahoo as a preferred source to see more of our stories on Google. The Sun's distance from Earth allows it to be habitable for life. DrPixel/Moment via Getty Images A popular model of evolution ...