In last week’s Medical Discovery News with David Niesel and Norbert Herzog: Researchers have documented more than 100,000 DNA sequence changes between Denisovans and modern humans. Of high interest were eight changes in genes that play a role in the “wiring” of the human nervous system, including one linked to autism and one associated with speech defects, raising questions about the speech and mental capabilities of these early ancestors. Scientists will continue to learn more about early humans and their predecessors using this new approach to DNA sequencing as a “molecular time machine.”