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" At first he assumed that he had screwed up the sequencing. “I thought it was a mistake, because sequencing was hard back then,” he says with a hearty laugh. But by 1992, when his data kept showing these regularly spaced repeats, Mojica wondered if anyone else had found something similar. Google did not yet exist, nor did online indexes, so he manually sorted through citations for the word “repeat” in a set of Current Contents, a printed index of scholarly papers. Because this was in a previous century, when very few publications were online, whenever he found a listing that looked promising, he had to go to the library to find the relevant journal. Eventually he found Ishino’s paper. "
― Walter Isaacson , The Code Breaker: Jennifer Doudna, Gene Editing, and the Future of the Human Race