climate.gov/news-features/blog
Alaskan research station temperature data results becomes so much of an outlier that automated data validation algorithms at NCEI decided to throw them away.

"Correctness of SQL Queries on Databases with Nulls"
sigmodrecord.org/publications/

Insight: SQL Null Value semantics are crazy, and doubly so when you get negation involved. The paper outlines a process for providing upper and lower bounds on query result sets involving nulls.

X marks the spot

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