[actionfromafar]

I love how merge-sort which was once used on punch cards because RAM was tight is still relevant. :)

[lanstin]

Knuth's section on sorting data on tape drives is surprisingly relevant to big data running over S3 buckets and streaming into compute.

[ThomasBHickey]

I can remember the days! I suppose as problems grow in size, it's not too surprising that older methods of coping with what seemed like lots of data are still applicable.