Recently came to know about the magazine in which the 8th Prof Shonku story was published:

"The term kalpabigyan was in fact coined as recently as 1962 by Adrish Bardhan to announce the first SF Magazine in Bangla, Ascharja ["Wonder"] of which he was the main editor, where it was initially associated with bigyanbhittik galpa." -

http://www.sf-encyclopedia.com/entry/bengal