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Planet EarthPlanet Earth

Trapped in Salt

Scientists have discovered water-filled air bubbles trapped in salt crystals that are fully a quarter billion years old. In this audio slide show, biophysicist Jack Griffith describes ancient cellulose fibers and even DNA that he's found within such bubbles using an electron microscope. The material, he claims, is the oldest biological material ever discovered.

ByRachel VanCottNova