I'd say not the depth, but the adaptability. Willingness for quick excursions into different areas of interest, including previously concealed ones. It'd be shameful not to catch with the unprecedented possibilities that the era supplies, for we're on the fragile segment of the curve, and any time the next Carrington Event may arrive, as it almost happened in July 2012, or an information blackout of some nature. ;)

As had been stated by Bester at the beginning of this Cambrian-like explosion: That magpie mind is always looking to pick up something.

otoh, back in the Antiquity or in the Middle Ages people routinely memorized songs thousands of lines long, as in The Tale of the Heike, and such an ability may have already been withered away.