I got this app probably five years ago, when I got my first iPhone. Like many people, I loaded up on as many free apps as I could possibly get into memory the first day. Most got opened once, maybe twice. Since then, every single one has been deleted - except this one.
It it something I can say that improves my productivity? No. Is it a good way to learn about a particular topic? Absolutely not. Is it something I can share with my kids? No way. Do I occasionally find something that scares the absolute %¥%t out of me? Yep. Is it something that bugs my wife 99% of the time when she sees me open it? It sure is.
So why do I still have it? Because it's something I can do when I'm killing a minute in line at the store or waiting to meet someone. It's completely harmless. AND... Every so often, I come across a piece of random, seemingly useless information that I actually file away for the future. A couple years back, I stunned my boss with a fact - one actually related to my field - and he told me later it actually was a deciding factor on my promotion, as crazy as that sounds. How many people are actually aware that eggplant is a fruit and that they are technically classified as berries? Not him, evidently.
It's a harmless app, but you never know when you might actually get the opportunity to impress someone at a party when you tell me their cat has 230 bones. Or that a starfish has no brain. You never know...