A black glove found near the Arizona home of missing 84-year-old Nancy Guthrie has yielded DNA that could be the key to solving the high-profile case, the FBI confirmed Sunday, Feb. 15. Federal investigators say the DNA,

Scientists have discovered that DNA behaves in a surprising way when squeezed through tiny nanopores, overturning a long-held assumption in genetics research. What researchers once thought were knots causing messy electrical signals turn out to be something else entirely: twisted coils called plectonemes,