Given tens of millions of years, wildly improbable events – like primates crossing oceans – are almost a given.
Genetic analysis has traced the evolutionary footsteps of modern humans all the way back to a prehistoric wetland that spanned parts of modern-day Botswana, Namibia and Zimbabwe.
Charles Darwin was one of the first to show connections in the variety of life by using a rough evolutionary tree. Things have developed quite a bit since then.
Scientists have uncovered genes they believe have been passed down from an ancestor organism that all life evolved from.