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Researchers may have discovered what makes hair turn gray, prompting hope that a treatment for preventing or reversing the process could be on the horizon. Published Wednesday in the journal Nature, the study shows certain stem cells, which have the ability to move between growth compartments in hair follicles, get stuck …

The attorney for an unnamed IRS criminal supervisory special agent says his client has asked Congress for protections to speak out about allegations that a years-long, high-profile and politically sensitive investigation has been hindered by “preferential treatment and politics,” according to a letter obtained by CBS News. That investigation is …

Update: Prosecutors have filed felony charges against the homeowner in the shooting. Read the latest here. Our earlier story is below. The investigation into the shooting of Ralph Yarl, a Black teenager who was shot by a homeowner after he went to the wrong house to pick up his younger …