A team of researchers affiliated with several institutions in France, working with a colleague from China and another two from Egypt, has found evidence that shows the Khufu branch of the Nile River once ran so close to Giza that it could have been used to carry the stones that were used to build the famous pyramids. In their paper published in Proceedings of the National Academy of Sciences, the group describes their study of fossilized pollen grains found in the sediments around Giza and what it showed them about the history of the Khufu branch.