Answer:
This is an example of the encoding specificity principle.
Explanation:
According to the encoding specificity principle, memories are connected to the context in which they were created. As a matter of fact, retrieving a memory will be more easily done if the context and the cues of the current moment somehow duplicate the conditions present when the memory was formed. That is why Sharon cannot remember who the veterinarian is. They are not in his office, he is not wearing the usual attire, and so on. The context and the cues do not resemble the usual ones.
During World War I, 116,516 US soldiers were killed and 204,002 were wounded. If you add those two numbers together, the total number of US soldiers killed or wounded was 320,518.
You can represent that as a fraction of the current population of Chicago like this:

For simplicity's sake (since I assume the Chicago population number is an estimate), let's round the number of soldiers killed or wounded down to 300,000. That would look like this:

We can simplify that down a lot by dividing the number of soldiers and the number of Chicagoans by the least common denominator of 300,000. That would give us this fraction:

So for every 1 US soldier killed or wounded in World War I, there are 10 Chicagoans living in the city today.
Answer:
The answer is the the invention is that it would be 6875266665634