What do you have on aliens?

We've got you covered! Took a few follow up questions to make sure we were on the right track (extraterrestrial life from a biological perspective--576.839, vs. human-alien encounters--001.942). This one was memorable because of the way the question was presented: dead earnest, very intense and urgent. I love getting swept up in these questions because I know the right book is out there for this person--we just have to find it.