Search the keyword phrase "previously unknown" in Google News. As of this writing, you get news of:
A previously unknown tribe of Brazilian Indians
A previously unknown Primo Levi manuscript, found at Yad Vashem
A previously unknown Modigliani painting, discovered in Serbia
A previously unknown 18th-century Philadelphia tea table, which topped six million at auction recently.
And previously unknown structure-specific functional mechanisms of flavonoids.
