Mystery #1Tier 2light
Why is the sky blue?
The Sun's light looks plain white, and the air is completely see-through. So where does all that blue come from, painting the whole daytime sky?
Your guess
What's your hunch: why is the sky blue, and not white or green or something else?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.