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Then the words got technical and statistical: Y chromosomes, mtDNA, an occurrence 9.04 million times more likely.

Scientists have known that this mitochondrial DNA, known as mtDNA, can escape into our cells and cause inflammation.

"We knew that mtDNA was escaping mitochondria, but how was still unclear," said Gerald Shadel, PhD, director of the San Diego-Nathan Shock Center of Excellence in the Basic Biology of Aging at the Salk Institute.

They found that the leak was triggered by a malfunction in mtDNA replication.

These overburdened endosomes respond by releasing mtDNA into the cell -- in short, the trash can overflows.