Useful (adj.): Helpful, beneficial, advantageous.

I used to love reading encyclopedias as a kid, back in the pre-internet days. Usually I would look up something specific that I was interested in, then after reading the entry, I’d either think of something else starting with the same letter, or I’d just turn the page, or flip through until I found something worth stopping on. I read some articles over and over. I had a cousin who told me she had read the entire Encyclopedia Britannica, and later knowing what would be her future educational successes, I’ve had no reason to doubt her. Inspired, I tried to…