In my experience, Sears is very good about refunding or exchanging items unless you bought it on a clearance "as is" sale. You'll have to take it back obviously but it probably is not doing you any good otherwise. You may want to call to see if they have the 50 Gal one so you know if you need to find it elsewhere.At least you could make phone calls to other stores to see if they have it in Sears doesn't.
That would let you combine the trip to return the 40 gallon with the one to buy a 50 gallon at another location.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.