From the effects of political upheaval on research to claims of gene-edited babies, the year has been a tumultuous one for the scientific community.

The recent discovery of 17 people who have inherited maternal and paternal lines of mitochondrial DNA has major ramifications for medical and ancestry research.

Researchers identify unique cases in which people inherited mitochondrial DNA not just from their mother but also from their father.

Researchers used TALENs and zinc finger nucleases to correct disease-causing mutations.

Even if people exercise, hydrogen peroxide and other reactive molecules continue to accumulate in the tissues.

Numerous cellular changes underlie the decline of muscle mass and strength in the elderly.

Researchers untangle the multifarious nature of muscle aging. So far, the only reliable treatment is exercise.

Among 11 infants treated to date, most survived and their heart function improved.

The parasitic plant manages to go without a component of mitochondria found in all other multicellular life forms.