Animal behavior. I never get bored learning about biology and specifically, all the interesting behaviors that animals have learned to reach their goals. Like elaborate mating dances, or long distance communication of whales.
Has it ever happened that you accidentally took some pests (like bed bugs or cockroaches) home in your clothes or bag and infected your own home with it?
I’ve upvoted comments that I disagreed with, but were well written an contributed to a good discussion. I only downvote for very low quality, spam or hateful comments.