"Icelandic "sagas" - histories of the Vikings that were passed down orally for hundreds of years before finally being transcribed in the 1900s"

This is not true. The sagas were not oral compositions (although they may have drawn on oral tradition) and they were written down in 13th and 14th centuries, not the 1900s.

Thank you!

It means that Shelby Electric Company happened to produce a perfect lightbulb -- an achievement that probably won't be repeated in our lifetime.