Book Riot Read Harder Challenge 2016: Read a middle grade novel. Ok, so it wasn't really a challenge of my normal reading habits to read a middle grade book, but I was glad for the excuse to read a new one, since I usually gravitate toward teen books. I hadn't read any Jennifer Holm except for the Babymouse graphic novels. 
 In this book, Ellie's grandfather figures out the secret to reverse aging, but rather than fame and fortune, he finds himself back in the life of a teenager -- the life when you have very little power or autonomy, and no one believes in you. He has to live with Ellie and her mom and enroll in middle school. But Ellie has a good chance to learn from him as a mentor and even teach him a little as a peer. This unique relationship makes for a very original grandparent story, and the science angle -- the way Ellie learns to appreciate science's skills of observation, perseverance, and consequences -- is particularly nice. 
 I listened to this on audio, and it was not my favorite. The reader did a great job, but her rendition of the grandfather's deep, gruff voice gave me a weird physical reaction (headache, weird feeling in my chest) that I've also noticed when some men sing falsetto (e.g., Guster). All I can think is that I don't like hearing strain in someone else's voice. Weird, huh?