dna

Graduate student Deanna Clemmer shares fun science experiments kids can do at home; she works in the laboratory of Harry E. Taylor. Biochemist/molecular biologist Wenyi Feng provides a brief explanation of the importance of DNA in our bodies. And stroke neurologist Hesham Masoud, MD, offers points to consider before visiting a marijuana dispensary.

Modern genomes from Nigeria and Sierra Leone show signals that scientists call "ghost" DNA — from an unknown human ancestor. That means that prehistoric humans likely procreated with an unknown group.

It all started with a fossil.“We have this polar bear jawbone from the Svalbard archipelago in the North Atlantic,” says Charlotte Lindqvist, a professor…