From Computerphile.

Learn this caching trick for faster code from Dr Mike Pound — Check out Brilliant’s courses and start for free at https://brilliant.org/computerphile/ (episode sponsor) — More links in full description below ↓↓↓
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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran’s Numberphile. More at https://www.bradyharanblog.com