Question: A photon starts moving in the random direction from the center of the square of size 3. Let’s say it first colloids to the glass wall AB. What is the expected distance traveled by the photon before hitting the wall AB again? . . C A P T A I N I N T … Continue reading Lumos

 The Red wedding

Question: A bad king has a cellar of 1000 bottles of delightful and very expensive wine. A neighbor queen plots to kill the bad king and send a servant to poison the wine. Fortunately (or say, unfortunately) the bad king’s guards catch the servant after he could poison only one bottle. Alas, the guards don’t know which … Continue reading  The Red wedding