Ask the Editor

Last Seven Days

Answer

Fussiness can be a virtue, almost a job requirement for editors! 
In this case, I'd stick with the "DID YOU KNOW?" version, as long as the text that follows is a complete sentence. Then DID YOU KNOW? serves as a headline, not part of the sentence. If the text following is not a complete sentence, I'd skip the ellipses and put a question mark at the end. In that case, "DID YOU KNOW each year, company scientists do lots of important work?" is a question in full-sentence form and should be punctuated as such. 

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