Editing Knuth reward check (section)

==Delays==
Knuth is often unable to answer immediately when a reader finds a mistake in one of his books or programs. In some cases, the delay has been several years. For example, on 1 July 1996, Knuth sent out more than 250 letters, 125 of which contained checks, for errors reported in ''[[The Art of Computer Programming]]'' since the summer of 1981. A few of these remain unclaimed as of May 2006.<ref>[https://cs.stanford.edu/~knuth/address.html What is your current mailing address?] {{Webarchive|url=https://web.archive.org/web/20180123092935/https://cs.stanford.edu/~knuth/address.html |date=2018-01-23 }} on Don Knuth's website.</ref> When Knuth is not able to reply immediately, he adds 5% interest, [[Compound interest#Continuous compounding|compounded continuously]], to the reward.