Dear 100 Hour Board,
My sister and I both agree that cat pee smells much worse than a human's. Why is this so? Does cat urine generally have a stronger odor to it? What causes it? Is it because they mark their territory that way and we don't?
Dear willy, nilly, silly ol' bear,
This article does a great job of explaining the phenomenon (and, as a side note, took me all of five seconds to find on the Google). Simply put, cats are, metabolically speaking, way more water-efficient than we are. They drink less water in the first place, and then when they urinate, their urine is much more concentrated with toxins, urea, steroids, pheromones, and other things that make a stinky all over your couch. This helps them conserve water, which is an admirable survival trait. (Dogs, on the other hand, are greedy moochers and don't bother to conserve anything.)
Fun fact: did you know that kangaroo rats almost never have to drink water? It's true! They get most of their water from their food and their urine is so concentrated that it's more of a crystalline powder than a liquid.