The Half-life of Planets — Emily Franklin

Liana is an aspiring planetary scientist . . . and also a kissing addict. This summer, though, she plans to spend every kissworthy hour in the lab, studying stars. Hank has never been kissed. He's smart and funny and very socially awkward, because he's got Asperger's syndrome. Hank's plan for the summer is to work at a music store and save enough to buy the Fender Jazzmaster he craves. What neither Liana nor Hank plans for is their fateful meeting . . . in the women's bathroom at the hospital. But their star-crossed encounter could be the very best kind. Two veteran YA authors tell, in alternating chapters, the story of two kids who discover that the best parts of people can't be summed up easily.