What are the odds that a buried animal would still have intact DNA after 125 million years? Researchers publishing in the journal Communications Biology said exactly that.¹ But it’s what they elected not to say that tells just as big a story.
 

About 1,600 years ago, salt miners in Iran apparently left their lamb lunch down the shaft. Their loss became scientists' gain. The now-mummified sheep carcass suggests that salt helps preserve sheepskin DNA.

Let’s say you recorded a library of books onto DNA. Hundreds of books could fit on your fingertip, but how would you find the one book you wanted?