Stamp Collecting

If you are wondering why this miscellaneous section is called "Stamp Collecting", well, don't expect a straight answer! Remember, this web site is all about questions, so here are your first questions for this section:

Who is the famous British scientist pictured in this old stamp from the USSR? What is the famous quote from this man about Stamp Collecting?

Found it? Well, now you know why I chose Stamp Collecting as the name of this miscellaneous section! No offence to the Chemists and Biologists...