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,

Appellate judges questioned DNA linking Richard Aguirre to 1986 murder Defense argued 2018 bag DNA resulted from lab transfer and testing protocols Prosecutors cited admissions and other evidence; judges seek records on bag testing The DNA that helped link ...

Savannah Guthrie has been on leave as the FBI and authorities in Pima County, Arizona, pursue investigative leads into Nancy Guthrie’s Feb. 1 disappearance.