Not a bad issue,but pretty ordinary. The Grandpa story is nice,like most of these kind it is the characterization which makes it,the "surprise ending" was obvious from the start."The Genius" is the best and most original story,I have read it before in reprint tho.That line about "memorizing the Encyclopedia Britannica" is a hoot tho.The last story would have been much better with a much better ending,I wonder if the anti climax was because of the comics code?
Link to the book:
Adventures into the Unknown 072