Lesser known is that SO content is generally under a CC-BY-SA license, which means not only attribution, but also "share-alike", which generally means releasing

Lesser known is that SO content is generally under a CC-BY-SA license, which means not only attribution, but also "share-alike", which generally means releasing derivative work under the same license... There is significant legal risk if your juniors are pasting non-trivial code from SO into your codebase verbatim...