How many pints in a fifth?

There are 1.5856236786469344608879492600423 pints in a gallon.

And now, one from the lighter side: Not enough!

The original "fifth" size liquor bottle was 4/5 of a pint, 1/5 of a gallon, or 25.6 ounces. The modern liquor bottle that we still call a fifth is actually 750 mls, which is 25.4 ounces, just a tiny bit less than the original fifth.