Why do math teachers love parks?

This punchline is a classic example of a pun, where the humor comes from a single phrase having two very different meanings. In the world of nature, a park is full of "natural logs," which are simply fallen trees. But in the world of mathematics, "natural logs" are a specific type of logarithm (the natural logarithm, or ln) that students typically encounter in higher-level algebra or calculus. The joke creates a funny, unexpected bridge between the great (Review) outdoors and the classroom.

The humor also plays on the stereotype of the dedicated, slightly nerdy teacher who is so passionate about their subject that they see it everywhere. It paints a charming picture of an off-duty math teacher walking through the woods, not just admiring the scenery, but also getting a little thrill from seeing a real-world, tangible version of an abstract mathematical concept. It’s a perfect dad joke for anyone who ever had to calculate the value of *e*.