Serious question, why is the sky blue while the air is clear? this doesn't make any sense at all. and yes i am serious.

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

norsemen from northern countries had made earlier journeys