How happy we are !!!
 

  One married couple and three strangers
 

  Shri is asking a research question to Abhinav and
  Naveen had an answer for that but is just listening
 

  Another married couple and two strangers
 
 

  Two old members and two new comers
 

  Cheers!!
 

  Can you find who is a professor ? He looks unbelievably
  young !! Or students look too old ???