0_Apprentice
My favourite colour is blue
1_Wizard
That's awesome. A fun fact is that blue eyes are the cause of an optical effect called Tyndall?
0_Apprentice
I do not know what Tyndall mean. Can you explain on that?
1_Wizard
That is the name of the man who discovered the effect. It is an optical effect, but I'm not sure what causes it. 
0_Apprentice
I see i will read further on it. Do you have a flair for blue color