A trio of anthropologists has decided it's time to rewrite the story of human evolution.
That narrative has always been a work in progress, because almost every time scientists dig up a new fossil bone or a stone tool, it adds a new twist to the story. Discoveries lead to new arguments over the details of how we became who we are.
It's 9 a.m. and the Mekong River at this hour is still peaceful: just a few fishermen casting nets into a large pool below the area called Si Phan Don, or "4,000 islands."
It's a popular tourist destination in Laos, where Southeast Asia's most storied river splits into nearly a dozen channels before coming together again below the islands of Si Phan Don, for the journey to Cambodia, Vietnam and the South China Sea. Cambodia is on my left, Laos to the right.