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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

Major funding for NOVA is provided by the David H. Koch Fund for Science, the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.