Questions with the keyword 'blue'

• why is the sky blue? by emdogpenghorton and 1 other. to Anil, Blanka, Cees, Emma, Mike Comments: (No comments so far )
• if we were to both look at a blue piece of paper, although we would both say we are seeing blue, are we actually seeing by millyrose to Anil, Blanka, Cees, Emma, Mike Comments: (No comments so far )