As writers, we're always researching. And, of course, the best place to do most of that research is the internet.
I've had other authors talk about some of the things they've had to look up for the sake of the potency of their story. I know I've certainly had to look up some strange things!
Some of the things I've researched:
Pagan spells and potions.
What wounds cause X amount of blood loss.
Types of guns.
Oh, I'm sure there are lots of other things, too. I just can't recall all of them at the moment. Other authors have researched inject-able drugs to knock people out immediately, what it feels like to be shot or stabbed. Effects of poisons. What people look like after being dead for X amount of time.
It's crazy, isn't it?!
Tell me in the comments, what's the weirdest/scariest thing you've Googled for book research? I look forward to reading your comments!!