I've always found it funny that, uniquely among modern Germanic languages, English uses the Indo-European root *gno- as the beginning point of our most common word for the concept "to know", which as the same meaning, while other Germanic languages prefer to use words derived from *weyd- (such as the German wissen) to mean the same concept, while that root generally means "to see" (Germanic languages do have variants of words descended from *gno- to mean specialized versions of the concept).