Ray-Ban sunglasses, Montreal -  These days it's difficult not to see people with the classic Ray-Ban style.   While smoking my cigar and talking to the Russian beauty, I decided to measure the life span of these glasses.  The calculation shows that the Ray-Ban classic should not last more than a season.   Do you wish to see the mathematical calculation?  If you do, then fly to Amsterdam and wait for me at the Central Station, track number 14b.