How often does the letter "e" occur in:
Q: Heinlein short story about Mr & Mrs Joseph Green saving the moon In one of Heinlein's short stories, two characters wind up saving the moon (or perhaps the universe).  The character Beetle Kelly (sp?) was involved.
What was the title, and in what collection did it appear?

A: Based on the names, I think there's a good chance you're thinking of the novella, "Gulf" (ISFDB), first published in Astounding in 1949.

The story postulates that humans of superior intelligence band together, and keeping themselves genetically separate, create a new species. In the process they develop into a hidden and benevolent "ruling" class. The story invokes the notions of the General Semantics of Alfred Korzybski and the work of Samuel Renshaw to explain the nature of thought and how people could be trained to think more rapidly and accurately. The material on human intelligence and self-guided evolution is intermixed with a more standard "secret agent" adventure story.
The driver of the plot is the "nova effect", which can initiate a chain reaction that consumes an entire planet. The last remaining documentation of the process is recorded on microfilm that the Federal Bureau of Security wants to obtain. The antagonist is "Mrs. Keithley", a deranged woman who happens to be one of the richest people in the Solar System, and who wants to use the nova effect to blackmail most of humanity, so she can rule from her home on the Moon.
"Joe" is a secret agent who is tasked with getting the microfilm. Returning to Earth, he is captured and finds himself confined with a man who calls himself "Kettle Belly" Baldwin. Using only two packs of playing cards to encode words, they communicate while under observation and plot their escape. Baldwin introduces Joe to his group of superior individuals and trains him in their advanced techniques of thought, even attempting telepathy. Baldwin reveals that he and his group work to keep dangerous science and technology out of the hands of common humans, for their own protection. The nova effect was discovered by Baldwin and implemented by his own people as part of an attempt to prove it could not be done.
Joe meets Gail, another agent, with whom he falls in love. Baldwin receives a warning that the nova effect is set to be triggered on Earth, but the triggering device is on the Moon. Joe and Gail are sent to disable the trigger so the device on Earth can be attacked. Gail has to get the remote control from Mrs. Keithley while Joe is charged with disabling the transmitter. The situation becomes desperate. Joe and Gail unexpectedly achieve telepathic rapport. Gail kills Mrs. Keithley, while Joe contends with the certainty that the transmitter is booby trapped. Knowing that they are both about to die, they telepathically recite their own private marriage vows before each being killed.

As per DavidW's comment, the story ends with:

The letters on the metal marker read: TO THE MEMORY OF MR. AND MRS. JOSEPH GREENE WHO, NEAR THIS SPOT, DIED FOR ALL THEIR FELLOW MEN

Found with a search for heinlein "joseph green" moon

user
I found 330 "e"s in the provided passage.
assistant