For some reason, I thought it would be interesting to follow “hay fever” through the days of the week. I couldn’t think of another good query to compare it against so I typed the same thing without quotes. The result was quite interesting:

It looks like Saturday Night Fever is pushing the unquoted version up at the weekend. The quoted version shows little change with the day of the week, as you might expect. Although people spend more time outdoors at the weekend, so you might expect some more mentions for Sat/Sun.

Switch off the y-axis zeroing and it all goes crazy (because we’re just amplifying noise):

And now, something slightly more interesting. Let’s look at “dengue fever” and “yellow fever” through time:

And let’s also see if they have different mental effects:

It seems that they do!

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