Many questions on this weblog would be answered if the individuals just read Who We Are and How We Got Here: Ancient DNA and the New Science of the Human Past. Not all questions would be answered. The book is dated in some ways, and there are certain lacunae. There are also things we still don’t know to any great satisfaction (e.g., Eastern Eurasia is under-understood). But to a first approximation, this book answers most big questions, at least from a scientific perspective.
Though American price on Kindle is $4.99, this may not be feasible for some readers. There are free preprints of almost all of the Reich lab’s publications on the lab’s website.
This post seems relevant since new readers may not be aware of the resources out there.