Scientists are using a rather interesting test to determine if expensive vintage whiskey really is, well, expensive vintage whiskey. The hook? Turns out all the open-air nuclear testing back in the 50s and 60s flung enough radioactive crap into the air to detectably alter whiskey distilled after that time. So now it would appear to be very easy to tell if, for example, a whiskey advertised as distilled in 1856 was actually made in 1956. There may or may not be a difference in flavor, but it definitely makes a difference in the price.

Which also answers a question I've had for years. Beer and wine will age to a certain point, but after that they spoil or go to vinegar. It would appear whiskey, at least, does not have this problem.