Libro The love hypothesis by Ali Hazelwood

As a third-year ph.d. Candidate, olive smith doesn't believe in lasting romantic relationships-but her best friend does, and that's what got her into this situation. Convincing anh that olive is dating and well on her way to a happily ever after was always going to take more than hand-wavy jedi mind tricks: scientists require proof. So, like any self-respecting biologist, olive panics and kisses the first man she sees.